It doesn't even do it good. It's easy to stalk your friends and see who they message the most and figure out when they do. It was just first.
This is what makes me despair about ever possibly being some sort of inventor/entrepreneur. While I was under the impression that cool new things are what people are after, what they're really interested in, apparently it's just... things like this.
Maybe I should just go make this game - http://www.youtube.com/watch?v=is12anYx2Qs