It's tough, because even within real friend circles there can be a lot of junk. I have a friend who constantly posts "What does your favorite color say about your personality?" type of stuff. I don't want to hide her posts because I don't want to miss anything actually important that happens in her life. But there's no clear line between that and the cruft that you can solve with a rule.

So either we train all our friends to use it sensibly -- and convince them to agree with us on what's sensible -- or we sort through cruft to find the value.