My money is on the facebook widgets embedded in other sites this guy visits. Like buttons, login buttons, perhaps a comment widget or three. Many users may not

My money is on the facebook widgets embedded in other sites this guy visits. Like buttons, login buttons, perhaps a comment widget or three. Many users may not realize that you don't need to actually click these widgets in order to be recorded by them. Unless you're using a blocker (e.g. Ghostery or DoNotTrackMe), your browser is pinging facebook every time they're included on a page. Visit a few gay porn sites that have those widgets embedded and facebook can make a pretty educated guess you're gay. Do porn sites not embed these things? Ok, how about any number of LGBTQ blogs, news sites, advocacy sites, or even sites that just show things that appeal slightly more to a gay audience than average, such as men's fashion or disney showtunes.