Really nifty idea. What I'd like to see is an option to not automatically unfollow the person after the day that you can set on this site - maybe the person who won that day is really interesting!
isn't it kind of self sorting though? If you were really interesting, you probably already would have a lot of followers, and therefore would have no need to join this sight to get more.
In a way, but I'm sure diamonds in the rough exist on Twitter like they do elsewhere on the web.
Lots of followers more often indicates "good at self-promotion". Most of the interesting folks I follow have a couple hundred at the most.