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.