You know how when you go to a website, even one you'd never share, you'll get a prompt to like/share the page or its contents on Facebook? Every time that Faceb

You know how when you go to a website, even one you'd never share, you'll get a prompt to like/share the page or its contents on Facebook? Every time that Facebook widget gets loaded, Facebook receives information about your browser/operating system/etc. that it uses to create a fingerprint that it checks against your previous history. You'll also get a cookie (which you essentially have to opt-out of) to better help Facebook track your browsing without needing the fingerprint. So many websites put up that little like button that Facebook's reach extends well beyond what users upload directly to their website. Facebook's strength is that is can combine your demographic data with your network AND your internet habits. Facebook, in countries where it's not blocked, will even build profiles on people that have not signed up for facebook directly, for example if your friend uploads a photo of the two of you with your name. And Facebook advertises to these people as well. So I think whatever isn't "more serious" that you do on Facebook is probably more serious than you think. You either need to be hyper vigilant about JS/cookies or you need to not use the internet at all to be able to divorce your profile and all of its information from the rest of the information Facebook has from you browsing the web.