And soon they will. Twitter is about to rollout Lists, a feature currently in testing, that will allow you to create your own custom lists of Twitter users that others can then follow with one click.
Lists will be public by default, which means your creations will be available for the world to view. Even better is that developers will be able to tap into the functionality to add the official Twitter Lists feature into their apps. Pretty nifty, right?
Here's an excerpt from Twitter's post on the announcement:
"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.
We started working on this feature because of the frequent requests we received from people who were looking for a better way to organize information on Twitter. Of course, that means not just twitter.com—the Platform team will follow up in a few days with information on the Lists API. This will allow developers to add support for Lists into your favorite Twitter apps."