As many of you know, this site is ad supported, and most of the revenue comes from search traffic. Our Google search traffic, which represents about 99% of our total search traffic, took an abrupt nosedive on October 29, 2012: All of a sudden, none of our content is ranking high in Google searches anymore. I have no idea why this happened. Don't even know where to begin. Google Webmaster Tools hasn't directed any malware on the site. Some sites running this forum software (vBulletin) have been the victim of redirect exploits, which take people who click on Google search results for site content and redirect them to some other site. Google penalizes sites which redirect in this way, but no one has reported such activity to me. Has anyone here noticed anything unusual?