Twitter is coming out with a new way to figure out who you should follow. Now you can search for key words, hash tags, or see who people you follow tweet with or follow. Soon, you will be able to lists of users that are categorized and recommended in groups. It sounds to me like a more formalized "#FollowFriday" where you can follow everyone recommended with a lot fewer mouse clicks.
"The idea is to allow people to curate lists of Twitter accounts. For example, you could create a list of the funniest Twitter accounts of all time, athletes, local businesses, friends, or any compilation that makes sense.
Lists are public by default (but can be made private) and the lists you've created are linked from your profile. Other Twitter users can then subscribe to your lists. This means lists have the potential to be an important new discovery mechanism for great tweets and accounts."