Facebook doesn't sell any data to advertisers. It allows advertisers to display an advert to a group of users based on broad demographic and interest informati

Facebook doesn't sell any data to advertisers. It allows advertisers to display an advert to a group of users based on broad demographic and interest information, without divulging information about the user. In some ways, this is similar to deciding to show a particular advert in "Time" rather than "People" in the more physical world. I realise some people (possibly including you) say "your data is being sold to advertisers" when they know how it works, but it is surprising how many people say the same thing and don't. (I work at Facebook.)