There are actually a number of different ways you can find people on Twitter. I'm going to give you a few sites that you can take a look at to find people to follow.
- You can, of course, start with searching for people directly from Twitter. Twitter searches for the real names that people enter into their bio fields, but there is no requirement to use your real name, so that can make it difficult to find whoever it is you're looking for. It also makes it hard to verify that the people you actually find are who they say the are, but it's a good place to start.
- Tweepz is a good source to go to to find followers, as well. It's hard to improve on Twitter much because of the lack of information required to be on the website, but they do a pretty good job. They let you limit searches to specific parts of Twitter's information, filter those results by follower/following numbers, location, and other extracted terms, and greatly improves on the layout of the search results.
- TweepSearch lets you search by Twitter name or location, or search a specific username to get a list of all friends and followers.
- TwitDir is a good one but searches about 3 million fewer users than Tweepz. It has some helpful top lists though if you're concerned with who the most popular or prolific people on Twitter are.
- Twellow is your best bet for finding like-minded Twitter users might be to use a directory, and is one of the most complete. Nearly 6 million Twitter profiles are indexed in Twellow and placed into a huge number of categories.
- There are others like WeFollow, Just Tweet It, Twubble, Twitterel, Who Should I Follow, and Mr. Tweet.
Those are just a few websites that you can check out to see who you should follow on Twitter.