SO: don’t use facebook sign-in anywhere, AND use Privacy Badger and other related tools to prevent the ability of facebook (and advertisers in general) to track you. Use noScript whenever possible. And if you wanna get funkier, proxy through other boxes, and/or hop onto Tor. Facebook et al’s greatest asset here is collective ignorance, and to the extent that any individual cares, that individual can indeed change the game dramatically.
And ps, don’t even use facebook at all, ever. If you can’t take that first step, the rest is probably crap.
