Don't be hatin', yo!
I've changed my username a lot, but unlike some I had the decency to tell my friends.
I have been on this site since 2005, and since that year I have changed, my likes, and dislikes, and with that came newer interests, and better ideas, so I change my username as I change, and you guys shouldn't disrespect people like that.
I can understand if they change, and don't tell which is why some of you are complaining, and you have every right...still people can change their usernames, and not be rude about it.