I think i know what you're talking about. Saw some videos as guest and then created youtube account and based on the videos watched while i a guest, youtube recommended me subscriptions 😕 it was creepy. Living without FB is literally impossible now-a-days. Stayed away from FB for nearly 1 year and couldn't do it anymore cause i was missing out on lot of activities! Best one can do is creat two accounts and use one for private use and use the another for signing up for websites and rest