EFF: “Recently, we published a blog post that described how to opt out of seeing ads on Facebook targeted to you based on your offline activities. This post explained where these companies get their data, what information they share with Facebook, or what this means for your privacy. So get ready for the nitty-gritty details: who has your information, how they get it, and what they do with it. It’s a lot of information, so we’ve organized it into an FAQ for convenience.”