Here's what to do about Facebook. (1) permanently close your account. https://www.facebook.com/help/delete_account (2) if you're like me and you can't do that, "unfriend" everybody except the people you work with. Delete all your affiliations and locations. If enough people did this FB would have to do a little struggling to retain membership. That's the kind of incentive they need. Altruism demonstrably doesn't work…
* Do not visit facebook often, do so only in incognito mode, delete other existing facebook cookies on all your browsers.
* Do not use facebook app, inform people that it is a battery hog and steals everything it can on your phone.
* Do not accept new friend requests, or send new ones.
* Do not post status updates or any other kind of content
* Do not "Like" things, do not comment. Do not produce anything for facebook actively.
* Keep it only as a place to check if other people upload pictures of you by scrolling the feed a little, to tell them to stop if they post information about you, use the web interface for messaging any friends who dont know any other means of digital communication.
* Sometimes Like things you dont, spread some misinformation, devalue what content/profile they already have about you.
* Ofcourse set all your posts to private, and all other "settings" to maximum privacy, allow noone to write on your "wall" and so on.