An exclusive excerpt from Every Screen On The Planet reveals how the social media app’s powerful recommendation engine was shaped by a bunch of ordinary, twentysomething curators—including a guy named Jorge. This week, President Donald Trump announced that he and Chinese leader Xi Jinping had agreed to terms that would allow the Chinese tech giant, ByteDance, to sell TikTok’s U.S. operations to a group of American investors. One vital asset that won’t be fully transferred in the deal—the platfor...