How long ago did you create your Twitter account? And how long after did it take to get your first follower?
You likely added a ton of people before you started collecting your followers, and given a few months, you probably were getting subtweeted by people you didn't even know. Ah, the memories. Now, if you want to go back and find out who your first follower was, you can. A new service from SocialRank lets you plug in your Twitter handle (or anyone else's) to find out who was their first.
Check it out here. Shout out to Complex Sports, by the way.