I just had something like this recently happen! One of my FB friends posted a status message saying something like:
"I am in the process of culling my friends list. I will be keeping only the people who have a special connection with me or who I feel add something to my life. Please feel free to check back over the next couple of days to see how you made out!"
Her next status, a day or so later, said, "Congratulations, if you're seeing this message then I have counted you worthy to remain my friends list, LOL! Thanks for being a part of my life."
Yay, good for me, I made it.
I just thought it was a really rude way to say to certain people, "I don't think you're special." I only hope she was mostly joking, because normally she's a really nice person. I do hope she didn't send people "feedback" on why they were being dumped....