My brother and I just made this Facebook app.
I feel like doing a Facebook app is just one of those things you should at least try - like camping, or colonic irrigation.
It's called Second Impression.
Basic idea: When you make a bad first impression on someone you can get on Facebook and issue a 'controlled' apology, telling the person how great you are normally.
We knocked it up in a couple of days so it's a bit under-designed and probably has glitches, but feel free to play around with it anyway. It's sorta fun.
Here's a sample of how Tom Cruise might use it...