Ever wonder why you can have 548 friends on Facebook, yet only 15-20 show up in your news feed? It’s not that those other friends have stopped using Facebook; chances are they’re still there. It’s just that they aren’t showing up in your news feed.
If you haven’t noticed, there are now two settings on your Facebook news feed: “Most Recent,” which shows most of the content published by your Facebook friends in chronological order and “Top News,” which filters content based on EdgeRank.
Friends and fan pages with a high EdgeRank are more likely to show in your “Top News” stream. Users with a low EdgeRank may not even show in your “Most Recent” news feed.