Tiktok’s recommendations are accurate because: 1) Unlike typical social media posts with text or images where engagement and interest is primarily determined through interaction, short-form videos presented one at a time make it very obvious whether or not a user is engaging with the content.

2) Because the content is so short, a user can easily and regularly scroll through many dozens of posts in a single sitting.

Combine those points with extensive manual and automatic tagging of every piece of content and you get very accurate interest-based suggestions that are constantly being refined. No need to take the schizo mind theft route