Marketers, and people building an account for their business. Follow anyone who looks like they might be interested in what you offer, remove the spammers (Twit

Marketers, and people building an account for their business. Follow anyone who looks like they might be interested in what you offer, remove the spammers (TwitCleaner's main use for me), and unfollow people who don't follow back after some time has passed. You can build a Twitter account with real followers pretty quickly that way.