Etiquette

When a boy asks you out on Facebook and you don't want to go, what is the proper response?

This was Candace's. It is much better than anything I came up with.

Hi, So-and-So. I’m awfully fabulous, and along with that comes being awfully busy. How about we meet up near my apartment, and you can buy me at least two cocktails? It’ll be super-convenient for me and super-lucky for you.