[spullara]

Based on your friends list and their data they can figure out tons of that stuff without you putting it on there. You probably don't even need to login for them to create a detailed dossier on you if you have connected with enough other people from various contexts.

[josephlord]

I know the contacts list gives them a lot on its own but I at least try to make it hard for them.

I know this sort of ridiculous because they are on FB and I don't mind them requesting me but I don't make friend requests on FB because it feels like I am leaking information about them to FB. It is illogical I know but it feels like it would be wrong for me to do it because I understand the information that a friend request reveals but that it is OK for them to do as they don't understand.

I asked for the data that they have on me once but they only give you the information you have entered not all their analysis and tracking data (they must at least do ad tracking) and they certainly track devices you have connected with. I complained to the Irish data protection agency (who have responsibility for FB in Europe) but only got a form response. I should chase again.

[RexRollman]

You can bet they are create dossiers on non-Facebook users, just like Google is probably creating dossiers on the people who send emails to Gmail users.