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I'm just curious if people know where online voting systems started.
First there was Digg, then there was .. ?
Slashdot predates Digg by about 7 years, and Slash has a voting system built in. I think it is (or at least, was) the canonical example of user-vote based moderation.
Well, the greeks invented democracy.
Semi-serious answer: The first "Me too" post on the usenet.
Which would have been some September sometime in the 70's...