Re: I use FB but never, ever the app
Still, FB is probably tracking you across many different activities as long as you're logged in and cookies and other data available to your browser(s), albeit somewhat restricted on your phone if the app is not active. While it will process your photos and their metadata, your data, your friends' data, etc. etc.
While on its surface it may just look a nice board and forum, behind it it's far more evil...