Why can't I follow people on twitter anymore?

[TT]

I tried to follow someone on twitter but I got an error message, which referred me to this page; http://help.twitter.com/forums/10713/entries/66885 - According to this explanation I can follow 2,000 people and I need more followers to be able to follow more people. But the thing is that I am following only 27 people and I'm being followed by 918 people. So I don't get the problem? I did unfollow a lot of people recently, could that have to do something with it?

[Webmktrsspk]

Your account seems to be significantly unbalanced and you probably appear to be a spammer to Twitter. If you don't rectify this, you risk having your account suspended.

Try following a significant amount of the people that are following you. If you're not following people, Twitter may think that you are just promoting and advertising and not engaging in social communication.

[Red R]

Yup twitter uses a "balance" to prevent bots..

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