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Seems like that's what it is. Only heard about it recently through another offhand reference in another HN comment.

Even just a quick glance at the stuff visible is pretty uhh.. interesting, I'd think it was a parody site if I didn't know better

Just looked. It does kind of come across as an elaborate parody...

It really does. But in their FAQs they don't have a "Is this an elaborate joke?" question, and they appear to validate work email addresses.