I found myself looking at "friend" posts almost exclusively, so I unfriended everyone late last autumn. I thought not having the easy source to my friends' posts (my "home" page) might encourage me to read what everyone else had to say. It turned out I didn't like what anyone else had to say so I just left entirely, and at the time I thought I wouldn't come back. At least I didn't really see much point in coming back.
But I did. And now that I'm 'back' I'm in no hurry to 'refriend' anyone, assuming they'd be my 'friend' at all anymore. A few people have sent me friend requests in the last three months or so and I've rejected them all. Nothing personal, chums. I figure the only thing I'm missing is a few people's 'walls', which I find kind of pointless. If anyone really wants to talk they can send me a PM, or (*gasp*) reply to my posts.