Doppelganger Week?

I signed onto Facebook a few minutes ago to send a friend a message. Apparently it's Doppelganger Week, which means you post a picture of a celebrity you look like as your profile picture. I applaud the use of the word "doppelganger," but deplaud (new word) the idea of defining yourself through someone else. Yes yes, it's all in good fun, but still, something about it rubs me the wrong way.