We've been talking in class about if Twitter had groups. There are a couple websites which come to mind. One of them is Twitter directory called We Follow. It tells you the most popular tags, and then you can pick one and it will show you all the Tweets about it. For example, if you click #music, JOhn Mayer is the first one to come up, and it tells you how many followers they have. It also separates Twitters by news, celebrities, comedy, and even things like travel.
Another website I found is called Twitter Campus... although I have found numerous problems with it. It seems as if the website is kind of new, because for some reason I can't seem to figure out how to add Fordham to the list. It does say thought that Emerson has the most amount of students on Twitter... hmmm, we should beat them Ashton Kutcher style!