> I know Facebook and the others are trying hard to make it clear what permissions are involved each time you sign-up What they don't make clear is that Facebo

> I know Facebook and the others are trying hard to make it clear what permissions are involved each time you sign-up What they don't make clear is that Facebook is informed every time people visit (or in some cases, login in to) those other sites and can generate better profiles from that data, even sleep schedules, even for people who rarely use FB itself.