Have you considered deactivating your facebook? Or, you could try using a browser extension like StayFocusd to limit your time spent on it. Or maybe you could just hide the annoying people from your news feed? I deactivated mine a few weeks ago to keep myself from impulsively deleting a ton of people (which I worried I would regret later), and I haven't looked back. I feel so free without it. Facebook did me more harm than good, anyway, since it only contributed to my feelings of loneliness.