Perhaps I should patent my faith system that allows for negative numbers. Seems reasonable...
(had to get that out of my system. feel better now.)
Then I read your last 2 sentences. Too weird! Also goes to show, again, what a joke the patent system is. Multiple people can "independently" come up with the same "innovation", given reasonably similar skills and context.
IANAL, but it appears that simply having a "question and answer" site doesn't apply to this patent. If you read the patent, it's mostly related to the idea of asking a question costs points and giving the best answer, as chosen by the asker, receives points.
Any variation on this scheme, such as a general moderator or the public via voting choses the best answer, or not having the asker assign points to a question to be received (avoid the economy, still have asker chose best answer) can avoid this patent.
Additionally, I find this point to hardly be the case. I love that on SO you can look below the answer to see another one with ten times as many votes and I know that's the better answer.
StackOverflow allows for both community voting AND for the original asker to indicate which answer was the best answer. I suppose the only thing it doesn't do is require the asker to select a best answer like EE does apparently.
Also, how in the world did they get this process patented?