WeFollow

User Directory

Creator: Kevin Rose

wefollow.com

In a social network with more than 6 million people, it can be difficult to find the most interesting Twitter users. Directory sites such as Kevin Rose's WeFollow invite users to list themselves with "tags," or subject areas they often write about, and then the site ranks the most popular users in each category. Rose has not revealed any plans to make money on the site.

See also: Twellow (www.twellow.com), Tweepler (tweepler.com), and Twubble (crazybob.org/twubble)