elsewhen - 11:42 am on Sep 14, 2011 (gmt 0)
System: The following 10 messages were spliced on to this thread from: http://www.webmasterworld.com/google/4362332.htm [webmasterworld.com] by tedster - 9:41 am on Sep 15, 2011 (EDT -4)
in the past, they mentioned that they _may_ use "block this site" data in the ranking algorithm, but tucked away in the following blog post, they claim to be using it now:
We’ve also started incorporating data about sites people have blocked into our general search ranking algorithms to help users find more high quality sites. In the future, we may experiment with data from non-US users’ blocked sites.