Addicted to Twitter
Great! But, do you know who’s following you? I mean, sure, you know their twitter ID but what do you really know about these people? Or, are they "people"? There are many direct marketers and other less-than-savory folks out on twitter. To protect yourself from these unfriendly followers, try using TwerpScan. The caveat is that you need to login to run this. Twerpscan will provide a list of followers they recommend blocking.
Another handy Twitter tool is TweetEffect. TweetEffect will let you know why people are choosing to follow you based on your latest tweets.
Lastly, if you want to check out the profile of a specific Twitter follower, try SocialWhois. For example, if you enter Robin611 (my Twitter id), you’ll see my self-defined Twitter description, what I’m interested in and where to find me online. SocialWhois is limited by the fact that information either comes from SocialWhois itself, Twitter or FriendFeed.