I know that Facebook-bashing seems like a theme for me (here's a recent post entitled "Why you shouldn't trust Facebook") but I just had yet another bad experience at the hands of the world's largest social networking site. Basically, Facebook started sharing my information without my permission with Yelp, another website I use, and I had to go through a time-consuming privacy-restoring exercise just to return myself to where I had started.
Anyway, here's a link to the Comparitech site which promises to" guide you through the steps to secure your privacy on all accounts and apps."