I don't know when you last used Facebook, or maybe it is your lack of use that is the problem, but it filters the feed to only show you stories from people you

I don't know when you last used Facebook, or maybe it is your lack of use that is the problem, but it filters the feed to only show you stories from people you interact with. It basically implements Google+ circles completely automatically for you. You may have accidentally turned this off, I suppose. There's an option for the feed to give everything sorted by date instead, although it isn't the default.