Yeah, I've unfriended a few people, like colleagues who have left that I didn't really know that well in the first place and have no contact with any more, but mostly I either don't accept friend requests or I keep people in a restricted group. This can be wives of my dh's friends, people that I like well enough and don't want to offend, but that I don't feel close enough to have them commenting on my random daily musings. Or old friends ditto. Or the ones who never post anything interesting of their own, but only use Facebook to promote commercial sites that their friends maintain. I figure that I can keep as friends anyone I like in person, but I only make content available to the ones who are likely to give some kind of response I would like to see.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett