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God knows. I rarely bother with these things. I think I just made friends in TFL places.
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I've found people like to follow users that post a lot, e.g. Space Whale, BioSmiley, and COWPIE. It doesn't really matter about the join date.
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Being an annoying, ignorant prick comes into account. *coughJOHNCENAcough*
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Or that post in/about topics that interest them. I'm fairly certain that's how I got my 13.