My Sporeum forum has an unfathomable system that ranks you up "evolutionary" stages, based upon post count, which forums you post in, your user rating, length of time you've been a member, news articles submitted, for solving science-related mysteries in a game, some other mysterious inputs and probably partially at random too. Right now I'm at the later stages of level 8: Paramecium.
It's fun, partly because we don't know what each stage is until we get there, but if all it does is give you a few stars then it's hardly worth it.
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