#and the real facemash had the ability to vote for girls And guys

[fakeoldmanfucker]

According to David Kirkpatrick in The Facebook Effect, the algorithm used to create Facemash could've come from chess (Eduardo) or fencing (Mark). I think it's likely that it was Eduardo, because Mark (and Dustin) consistently, if not often, try to downplay Eduardo's importance, and Kirkpatrick doesn't say anything definitive.