Who Are Your Twitter Followers?

GigaOhm does a good job providing a case study of how to best understand your Twitter followers. This starts to answer a question I have had recently: Just who are these 500 people who follow me? Unless you block, or set up a restrictive follow policy, anyone can follow you. I often look at a follower's profile before I decide to re-follow. There are obvious answers: Common interests, Local Businesses, Want to sell me something etc. But what other characteristics do followers have? It turns out, because of the relatively open Twitter API, there are some tools you can use to find this out. Good case study.