It has been almost a year already since I decided to stop using facebook. Tell you what, It feels great not seeing all these showbiz personalities, the faces of these stupid politicians, the drama etc...Would you quit facebook?, just try it and I assure you of one thing and that's "Reality".
I think of having Facebook and most social media (excluding Twitter) as a necessary evil. If you use it to connect with new people and stay in touch with people you genuinely can't connect with in any other way (call, text, in person) than it's a positive force. I use mine mostly for business purposes. Without it, I would not be able to market my app as well!