Browsing history: many apps (like reddit, Instagram) have their own browser in the app so they can track it, and they nag you to use their app when you open the

Browsing history: many apps (like reddit, Instagram) have their own browser in the app so they can track it, and they nag you to use their app when you open their website. Biometric identifiers, I'm guessing mostly facial features: if you take a selfie/self-video with TikTok (which millions of people do) they can just take the data from there.