Unless you installed AdBlock[Plus], uBlock[Origin], Disconnect, Ghostery, etc - then facebook knows about every page you've ever visited that had a "like button", whether you were logged in to facebook at the time or not, whether you've pressed the "like button" or not. Did you intend to tell them that? Your browser did anyway.
Also, they know everything your friends say about you (your pictures, which they feed into their face rec engine to find you even if you weren't tagged; and the exif data in those pictures often gives location data ...). And they have a shadow profile of you even if you never created a profile yourself.
Oh, and they have a copy of your phone contacts if you use the FB app or the whatsapp app.
All of this is documented by Facebook.
Facebook knows a lot more about you than what you are explicitly telling it.
Also, they know everything your friends say about you (your pictures, which they feed into their face rec engine to find you even if you weren't tagged; and the exif data in those pictures often gives location data ...). And they have a shadow profile of you even if you never created a profile yourself.
Oh, and they have a copy of your phone contacts if you use the FB app or the whatsapp app.
All of this is documented by Facebook.
Facebook knows a lot more about you than what you are explicitly telling it.