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There’s no shortage of TikTok coverage in the news today as the app’s fate in the U.S. hangs in the air.
What the press doesn’t always address is how TikTok gets here — how did a Chinese startup seize the lucrative short-video market in the West before Google and Facebook? What did it do differently from its Chinese predecessors who tried global expansion to little avail? Matthew Brennan’s new book “Attention Factory” set out to answer these questions by tracing ByteDance’s trajectory from an underdog despised by Chinese tech workers and investors to the envy of Silicon Valley and the target of the White House.
Matthew has spent years working closely with China’s tech firms, not only analyzing them but also using their products as a curious local, experiences that informed his meticulously researched and entertaining book. Interwoven with captivating anecdotes of TikTok, rare photos of ByteDance’s original team, incisive analysis and telling infographics, “Attention Factory” is an essential read for those looking to understand how ideas in the American and Chinese internet worlds collided, coincided and converged throughout the 2010s.
TikTok is a rare example of a Chinese internet service that has gained worldwide success. Before expanding overseas, ByteDance had already proven the short-video model in China through Douyin, the homegrown version of TikTok.
The excerpt below follows a high-growth period of Douyin, detailing how it gained around 200 million daily active users within a year: a loyal creator community, viral memes, algorithmic recommendation and aggressive ad spending.
Before long, the Chinese startup would replicate that growth playbook in the rest of the world, tweaking it here and there to make it work.
Hundreds of fashionably dressed young people were arriving at 751 D.PARK, an expanse of industrial plants redeveloped into a hip culture venue in northeast Beijing. They were clad in baseball caps, brightly colored dresses, loose-fitting hip-hop style streetwear and limited-edition sneakers. The site had been transformed into something akin to the stage of the talent competition “American Idol,” spanning two floors filled with strobe lighting, high-volume music and trendy backdrops. This was an exclusive party — three hundred top Douyin creators coming together to celebrate the app’s one-year anniversary.
The online stars, billed as the “new generation of internet celebrities,” weren’t there to just socialize and enjoy themselves. Every influencer was aware of the unspoken competition to derive the best content from that night. They were all fighting to achieve a higher level of superstardom and the medium of battle was short video.
The influencers who knew each other gathered in small groups as their assistants tirelessly captured fifteen-second videos of their carefully crafted skits. Loners roamed around the dance floor, absorbed in finding the ideal lighting for their lip-syncing selfie videos. Lesser-known influencers nervously approached more famous ones, proposing to record a dance together to potentially tap into their peers’ following. Loud hip-hop music kept playing in the background as creators hurried to touch up the videos they had just shot. Once the editing was done, they uploaded their works and anxiously waited for the app’s algorithms to judge who would grab more eyeballs.
Dance teams took to the stage to display their skills. The crowd bopped their heads back and forth as rappers attempted to impress with clever lyrics. Later as the hosts were midway through giving out awards, a wave of noise erupted from the back of the crowd interrupting the proceedings.
It was Yiming. Dressed in a black baseball cap and gray T-shirt and accompanied by Lidong. The audience went wild — the CEO had decided to drop in unannounced! Immediately he was bombarded with requests to take pictures and videos. As those around him whooped and cried out wildly, the entrepreneur simply smiled and kept his hands calmly by his side, an awkward 34-year-old engineer type among the hyper fashionable, mostly teenage hip-hop crowd.
Yiming and Lidong appear at a Douyin promotional event marking the app’s first anniversary in Sept 2017.
He already knew from looking at the data, but this was confirmation in the flesh — Douyin had built a robust community, with powerful momentum and was on the verge of doing something special.
October 1st marks the beginning of “Golden Week,” a seven-day-long official Chinese national holiday. Periods like these are big opportunities for China’s internet industry. People’s behaviors change for a week; many find more time for entertainment and to try new things.
Over October, Douyin’s daily users doubled from seven to 14 million; two months later, they reached 30 million. Over those three months, the 30-day retention rates jumped from eight to over 20%, the average time spent in the app soared from 20 to 40 minutes. It was as if some magic rocket fuel had suddenly been added, boosting every key metric. What had changed?
The answer was Zhu Wenjia. Zhu Wenjia, hired from Baidu in 2015, was widely considered to be one of the top-three best people in the entire company when it came to algorithm technology. He ran one of ByteDance’s most capable engineering teams and had recently been assigned to work on Douyin. The team’s work harnessing the full power of ByteDance’s content recommendation back end led directly to the astounding October results.
The better the metrics, the more resources ByteDance placed behind the app as it now had good retention and was fast-tracked into becoming a strategically important product. Suddenly support was coming in from all over the company — people, money, user traffic, celebrity endorsements, brand collaborations, and most importantly, full integration and optimization of ByteDance’s powerful recommendation engine. Chinese stars with massive fan bases such as Yang Mi, Lu Han, Kris Wu, and Angelababy opened accounts, joining in publicity campaigns, and a nationwide “Douyin Party” event roadshow was planned. Douyin had become the hottest upcoming app in China.
ByteDance ramped up the investment in all three short-video products, including Douyin. People, resources and advertising budget were all raised, leading an industry insider to comment later: “The sudden rise of Douyin wasn’t without good cause. Yiming threw more money at this than anyone and dared to hunt down and grab the best people.”
Commercialization began with the first three brand ad campaigns paid for by Airbnb, Harbin Beer and Chevrolet. Douyin’s advertising business would soon make rapid progress. ByteDance already had hundreds of sales and marketing staff who would shortly be able to add Douyin’s advertisement inventory to their sales targets.
Yiming revealed in a later interview that the company had made it compulsory for everyone on the management team to make their own Douyin videos with goals to gain a certain number of likes or suffer forfeits such as doing push-ups. It wasn’t good enough to just look at charts and data; management needed to understand short videos from a creator’s perspective also. Yiming had watched Douyin videos for a long time but creating his own was “a big step for me,” he admitted.
Yiming’s personal Douyin account (3277469). Seventeen videos at the time of writing, including clips from his global travels.
The video opened to a young woman yawning, dressed in pajamas with messy morning hair. Wearing glasses and with no signs of makeup, she casually lip-syncs the line, “Oh well … karma’s a bitch” and throws a silk scarf into the air. Suddenly loud background music explosively begins. In an instant, she transforms into a glamorous fashion model, almost unrecognizable from a second before. A new meme had taken hold of Douyin.
“Karma’s a bitch” was a new version of the original “Don’t judge me” challenge that had propelled Musical.ly to top the U.S. app store three years earlier. The meme was another breakthrough for Douyin; People loved watching the shocking transformations. Compilations of the meme’s videos started popping up online. In particular, the makeup skills of some women left many men in disbelief. “Karma’s a bitch” left an impact on mainstream culture and gained widespread recognition and publicity, even making waves out into English language global media.
Douyin was also increasingly hypercharging the popularity of catchy pop songs with strong hooks. In late 2017, a track known as the “Ci-li-ci-li song” exploded on Douyin. The song’s catchy energy was undeniably infectious. Yet, it was the novel set of dance moves that had become associated with the track’s hook that turned the music into a meme and dramatically amplified its success.
The track had actually been released back in 2013 by Romanian reggae and dancehall artist Matteo, under the name “Panama.” Four years after its debut, the song’s unexpected and explosive spike in popularity led the singer to hastily organize an Asia tour to capitalize on his track’s sudden fame. A YouTube video shows him meeting Chinese fans at the Hangzhou airport who demonstrate their moves to him in the arrivals hall. With the dance having been created entirely in China, the bewildered artist finds himself in the awkward situation of not knowing how to follow the moves to the song for which he is famous.
Perhaps the most reliable indicator of the platform’s increasing influence on society was how the name, Douyin, had started to enter everyday colloquial vernacular, becoming synonymous with short video. The meaning of “Let’s shoot a Douyin!” needed no explanation.
ByteDance knew they now had a winning formula. Retention was good, word of mouth was excellent, a large, vibrant community of video creators had been fostered. The recommendation engine was doing its job of surfacing the best content. Douyin’s fire was already burning bright; now, it was time to pour gasoline on things and spend, spend, spend.
The holiday week of Chinese New Year is another unique annual opportunity for app promotions. Hundreds of millions travel home to be reunited with their families and find themselves with free time to relax. An entertainment app like Douyin was the perfect way to pass the time; word of mouth spread naturally between family members.
To step up its efforts further, Douyin directly gave out money to users by running a Chinese New Year “lucky money” campaign. Users could collect small cash amounts in special videos by tapping on the “red packet” icons — a digital manifestation of cash-filled envelopes people give to each other during the holiday. ByteDance also went all out, spending wildly, buying adverts and promotions across major online channels to acquire users, spending about 4 million yuan a day (over half a million dollars). The combination of all these effects sent Douyin to the top of the Chinese app store charts. Various reports stated Douyin’s daily users jumped from around 40 to 70 million over the February to March period covering Chinese New Year, with some of the top accounts seeing their follower numbers quadruple.
A chart mapping the progress of Douyin, from zero to 200 million daily active users, during the first two years of operation.
This article is an excerpt from “Attention Factory: The Story of TikTok and China’s ByteDance,” which was written by Matthew Brennan and edited by TechCrunch reporter Rita Liao, who wrote the introduction to this post.
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TikTok parent company ByteDance has built technology to let you insert your face into videos starring someone else. TechCrunch has learned that ByteDance has developed an unreleased feature using life-like deepfakes technology that the app’s code refers to as Face Swap. Code in both TikTok and its Chinese sister app Douyin asks users to take a multi-angle biometric scan of their face, then choose from a selection of videos they want to add their face to and share.
With ByteDance’s new Face Swap feature, users scan themselves, pick a video and have their face overlaid on the body of someone in the clip
The deepfakes feature, if launched in Douyin and TikTok, could create a more controlled environment where face swapping technology plus a limited selection of source videos can be used for fun instead of spreading misinformation. It might also raise awareness of the technology so more people are aware that they shouldn’t believe everything they see online. But it’s also likely to heighten fears about what ByteDance could do with such sensitive biometric data — similar to what’s used to set up Face ID on iPhones.
Several other tech companies have recently tried to consumerize watered-down versions of deepfakes. The app Morphin lets you overlay a computerized rendering of your face on actors in GIFs. Snapchat offered a FaceSwap option for years that would switch the visages of two people in frame, or replace one on camera with one from your camera roll, and there are standalone apps that do that too, like Face Swap Live. Then last month, TechCrunch spotted Snapchat’s new Cameos for inserting a real selfie into video clips it provides, though the results aren’t meant to look confusingly realistic.
Most problematic has been Chinese deepfakes app Zao, which uses artificial intelligence to blend one person’s face into another’s body as they move and synchronize their expressions. Zao went viral in September despite privacy and security concerns about how users’ facial scans might be abused. Zao was previously blocked by China’s WeChat for presenting “security risks.” [Correction: While “Zao” is mentioned in the discovered code, it refers to the general concept rather than a partnership between ByteDance and Zao.]
But ByteDance could bring convincingly life-like deepfakes to TikTok and Douyin, two of the world’s most popular apps with over 1.5 billion downloads.
Zao in the Chinese iOS App Store
TechCrunch received a tip about the news from Israeli in-app market research startup Watchful.ai. The company had discovered code for the deepfakes feature in the latest version of TikTok and Douyin’s Android apps. Watchful.ai was able to activate the code in Douyin to generate screenshots of the feature, though it’s not currently available to the public.
First, users scan their face into TikTok. This also serves as an identity check to make sure you’re only submitting your own face so you can’t make unconsented deepfakes of anyone else using an existing photo or a single shot of their face. By asking you to blink, nod and open and close your mouth while in focus and proper lighting, Douyin can ensure you’re a live human and create a manipulable scan of your face that it can stretch and move to express different emotions or fill different scenes.

You’ll then be able to pick from videos ByteDance claims to have the rights to use, and it will replace with your own the face of whomever is in the clip. You can then share or download the deepfake video, though it will include an overlayed watermark the company claims will help distinguish the content as not being real. I received confidential access to videos made by Watchful using the feature, and the face swapping is quite seamless. The motion tracking, expressions and color blending all look very convincing.
Watchful also discovered unpublished updates to TikTok and Douyin’s terms of service that cover privacy and usage of the deepfakes feature. Inside the U.S. version of TikTok’s Android app, English text in the code explains the feature and some of its terms of use:
Your facial pattern will be used for this feature. Read the Drama Face Terms of Use and Privacy Policy for more details. Make sure you’ve read and agree to the Terms of Use and Privacy Policy before continuing. 1. To make this feature secure for everyone, real identity verification is required to make sure users themselves are using this feature with their own faces. For this reason, uploaded photos can’t be used; 2. Your facial pattern will only be used to generate face-change videos that are only visible to you before you post it. To better protect your personal information, identity verification is required if you use this feature later. 3. This feature complies with Internet Personal Information Protection Regulations for Minors. Underage users won’t be able to access this feature. 4. All video elements related to this feature provided by Douyin have acquired copyright authorization.
ZHEJIANG, CHINA – OCTOBER 18 2019 Two U.S. senators have sent a letter to the U.S. national intelligence agency saying TikTok could pose a threat to U.S. national security and should be investigated. Visitors visit the booth of Douyin (Tiktok) at the 2019 Smart Expo in Hangzhou, east China’s Zhejiang province, Oct. 18, 2019.- PHOTOGRAPH BY Costfoto / Barcroft Media via Getty Images.
A longer terms of use and privacy policy was also found in Chinese within Douyin. Translated into English, some highlights from the text include:
“The ‘face-changing’ effect presented by this function is a fictional image generated by the superimposition of our photos based on your photos. In order to show that the original work has been modified and the video generated using this function is not a real video, we will mark the video generated using this function. Do not erase the mark in any way.”
“The information collected during the aforementioned detection process and using your photos to generate face-changing videos is only used for live detection and matching during face-changing. It will not be used for other purposes . . . And matches are deleted immediately and your facial features are not stored.”
“When you use this function, you can only use the materials provided by us, you cannot upload the materials yourself. The materials we provide have been authorized by the copyright owner”.
“According to the ‘Children’s Internet Personal Information Protection Regulations’ and the relevant provisions of laws and regulations, in order to protect the personal information of children / youths, this function restricts the use of minors”.
We reached out to TikTok and Douyin for comment regarding the deepfakes feature, when it might launch, how the privacy of biometric scans are protected and the age limit. However, TikTok declined to answer those questions. Instead, a spokesperson insisted that “after checking with the teams I can confirm this is definitely not a function in TikTok, nor do we have any intention of introducing it. I think what you may be looking at is something slated for Douyin – your email includes screenshots that would be from Douyin, and a privacy policy that mentions Douyin. That said, we don’t work on Douyin here at TikTok.” They later told TechCrunch that “The inactive code fragments are being removed to eliminate any confusion,” which implicitly confirms that Face Swap code was found in TikTok.
A Douyin spokesperson tells TechCrunch “Douyin follows the laws and regulations of the jurisdictions in which it operates, which is China.” They denied that the Face Swap terms of service appear in TikTok despite TechCrunch reviewing code from the app showing those terms of service and the feature’s functionality.

This is suspicious, and doesn’t explain why code for the deepfakes feature and special terms of service in English for the feature appear in TikTok, and not just Douyin, where the app can already be activated and a longer terms of service was spotted. TikTok’s U.S. entity has previously denied complying with censorship requests from the Chinese government in contradiction to sources who told The Washington Post that TikTok did censor some political and sexual content at China’s behest.
It’s possible that the deepfakes Face Swap feature never officially launches in China or the U.S. But it’s fully functional, even if unreleased, and demonstrates ByteDance’s willingness to embrace the controversial technology despite its reputation for misinformation and non-consensual pornography. At least it’s restricting the use of the feature by minors, only letting you face-swap yourself, and preventing users from uploading their own source videos. That avoids it being used to create dangerous misinformational videos like the slowed down one making House Speaker Nancy Pelosi seem drunk, or clips of people saying things as if they were President Trump.
“It’s very rare to see a major social networking app restrict a new, advanced feature to their users 18 and over only,” Watchful.ai co-founder and CEO Itay Kahana tells TechCrunch. “These deepfake apps might seem like fun on the surface, but they should not be allowed to become trojan horses, compromising IP rights and personal data, especially personal data from minors who are overwhelmingly the heaviest users of TikTok to date.”
TikTok has already been banned by the U.S. Navy and ByteDance’s acquisition and merger of Musical.ly into TikTok is under investigation by the Committee on Foreign Investment in The United States. Deepfake fears could further heighten scrutiny.
With the proper safeguards, though, face-changing technology could usher in a new era of user-generated content where the creator is always at the center of the action. It’s all part of a new trend of personalized media that could be big in 2020. Social media has evolved from selfies to Bitmoji to Animoji to Cameos, and now consumerized deepfakes. When there are infinite apps and videos and notifications to distract us, making us the star could be the best way to hold our attention.
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