I don't know what's worst, ads or the fact that fb tracks everything.

In case you didn't know. If you ever want to delete a photo or video from Facebook, they won't allow you to delete more than one at a time. So if you want to delete anything guess what, you can't​ delete your own stuff at once, even if they are just a bunch of old food pictures unless it's an album. It's nice to have something to keep in touch with some people you wouldn't normally see or who are very far away. Everything getting tracked nowadays, no so nice.
https://tenplay.com.au/news/national/june-2017/facebook-wants-to-spy-on-you-through-webcam-and-smartphones