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If you adopt a word, you will receive a neat certificate like the one Newrosis just got for adopting the word vampirarchy, which means an archy of vamps. I kid...it is a society ruled by vampires! well, the technical definition is a society ruled as if by vampires, but this obviously calls into question the existence of actual vampires, which I don't approve of.
There is also a "word of the day" feature and some other stuff you can sign up for.