It definitely has an impact, and we have no real way of knowing how much we're actually detecting. But sometimes we feel that there's something that doesn't make sense in the application, or we have concerns with a particular letter, or we get a “poison pen”, or we get other information. We feel that it is our responsibility to the greatest extent possible to try to detect it and find out whether it's accurate and what we can do about it.
On March 10th, 2011. See this statement in context.