TikTok Tracked User Data Using Tactic Banned by Google

TikTok skirted a privacy safeguard in Google’s Android operating system to collect unique identifiers from millions of mobile devices, data that allows the app to track users online without allowing them to opt out. The tactic, which experts in mobile-phone security said was concealed through an unusual added layer of encryption, appears to have violated Google policies limiting how apps track people and wasn’t disclosed to TikTok users. TikTok ended the practice in November 2019. The identifiers collected by TikTok, called MAC addresses, are most commonly used for advertising purposes.