Early last year, TikTok was on top of the world.It had temporarily dethroned Google as the most visited website on the internet, and competitors such as Instagram and YouTube were scrambling to mimic the short video clips that made TikTok a sensation.But at that very moment, inside TikTok, the app's leaders were putting their heads together about how to respond to a slowdown in the growth of its audience in the U.S., the world's biggest market for online advertising.
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