TikToksaid last year that it reached one billion monthly active users worldwide, so whatever it's doing is clearly working. That hasn't stopped the ByteDance-owned company from testing and introducing new features, though, including those that put it in direct competition with YouTube. Case in point, its latest experiment that gives select users worldwide access to a horizontal full screen mode for videos they watch on their phones. 

The company has confirmed to TechCrunch that users chosen...

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