Twitter has a limit, once you are following 2000 people you are unable to follow additional people. This is explained here: http://help.twitter.com/forums/10713/entries/66885 > this limit is designed to discourage spam.
A workaround to this limit is to create a Twitter List and add the person you want to follow to that list. This doesn’t seem to count against the follow limit and allows you to follow additional people.
Twitter Lists: A Workaround to the Follow Limit
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