DMCA removal requests: This is, by far, is the most effective and scary negative SEO tactic. Knowing Google and Bing’s IP addresses can be helpful if using IP detection as a method for identifying and stopping bad crawlers.
We asked for removal by no later than today of all zF Red Zone functionality that discloses any alternate account names. In addition, we asked for removal by no later than Friday of the interface for and any remaining implementation of the zF Red...
Google Releases Improved Content Removal Tools, Search Engine Land Marshall also said that invalid click detection should be like an airport metal detector, tuned to over-report instead of under-report.
Inktomi Content Policy- Spam Removal Guidelines http://www.inktomi.com/products/search/content_policy.html They have been placed on the list so that they don't accidentally get banned by the automatic spam detection system.
