dvduval - 5:37 pm on Apr 5, 2013 (gmt 0)
They are also hacking into sites to gain links for the resale of pagerank. I followed a hacker that placed hidden links or dozens of pagerank 8 and 9 sites. I reported the hacker to google and months have passed and the sites are still showing pagerank and they are then selling links on their sites. This case involved many high profile sites that were hacked. Multiple people reported it to google. As best as I can tell Google is not investing much time or effort in search, and instead working on more profitable parts of their business.