Google - "Wisdom of the Crowds" approach when verifying factsAn important part of Google's ranking is popularity -- those sites that are linked to more frequently rise to the top. If you are looking for factual information, say the capital of Burkina Faso, I would scan several of your top results and see if they agree. What are the odds that several popular sites are going to be wrong about a factual piece of information? If they are, then it's the general consensus that is wrong, which would be interesting in of itself...