The Zero Knowledge Foundation’s explainer on privacy policies is a pretty good introduction to where the fine-print on the sites you read comes from, and the surprisingly meaningful differences between different privacy policies on different sites. It’s easy to assume (as I usually do) that the average privacy policy says, “You have no privacy,” but there’s a lot of difference between the policies on Craigslist, Facebook and Twitter, say.
The Fine Print of Privacy | Zero Knowledge Privacy Foundation
(Thanks, Josh)