User blog comment:Paul.rea/Teen Wolf News 020315/@comment-13965604-20150205133500/@comment-4091815-20150205201933

Oh my - it goes deeper than that! You can order up your demographics by any age range, gender, race or belief in UFOs.

Advertisers want to target specific audiences and some of them are so niche they need to know what 6-year-olds are watching between 3:00 and 3:15 on Tuesdays.

It's why Facebook and Google gathers every scintilla of info you'll let them - advertisers want specific targets.