Facebook is scary-good at targeting ads. To provide this level of targeting to advertisers, Facebook has to pull from a staggering amount of data that each of us post to the social network without really thinking much about. Our political leanings, the technology we use and even our location (and whether we live near family) are all fair game for creating these dossiers on each and every Facebook user.
In essence, Facebook is trying to shove each of us into a number of boxes that accurately portray who we are, and what we might be interested in. This is what those boxes look like.http://thenextweb.com/facebook/2016/08/23/ever-wonder-what-facebook-knows-about-you-heres-how-to-find-out/