The researcher also examined in-app browsers for other apps like Instagram and Facebook Messenger, which don’t appear to track as much as TikTok.

While TikTok said the code’s only used for debugging, researchers also found Meta products Facebook and Instagram can track users’ in-app browser.

TikTok's custom in-app browser on iOS reportedly injects JavaScript code into external websites that allows TikTok to monitor "all keyboard inputs and taps" while a user is interacting with a ...