I know that i like to keep my Follow numbers pretty low to filter out the noise. I like everyone in my 'bucket' to be an active twitter user, say interest things, and - hopefully - interact with me. I like the interacting part a great deal. So I weed out those I follow to keep it to those I like or find interesting.
Some people just want to acquire followers...and get there by following everyone, without discernment.
You see this often, where someone will have 10,987 people they follow - I frankly do not see the point of that for the average person. It leads to a lot of noise. For a celebrity or A-list blogger, sure, why not? Or for a business, yeah, okay.
But in the meantime, while people figure out what they want their follow/follower ratio to be, there is a group of hackers playfully working on a social experiment -
Are Twitter Users Social Currency? Read this and let us know what you think. Are followers like money, to be exchanged for good and services? Are people on twitter social currency? Would you play this game?