It's difficult to rank all the content that is posted on Facebook - filtering by time is one easy pivot, but IMO it becomes difficult to pull the signal out (I find twitter to be a torrent of data I can't keep up with).

The upside is that time is an easy pivot to understand, and if someone close to you posts something and immediately asks you "do you see my post?", it's trivial to answer with confidence.

It would be nice if Facebook exposed controls to allow users to sort their news feed - by time and by whatever other metrics they're currently using.