The social media service TikTok is known for how it algorithmically decides which videos you want to watch. The Wall Street Journal created dozens of automated accounts to see how it works so well, or rather, how it tends to send people down rabbit holes that may not be healthy.

It should come as no surprise that TikTok collects a vast amount of data from its users. Now the company is being more upfront about some of that biometric data. Transparent, but creepy.