aakk9999 - 12:52 am on Aug 17, 2012 (gmt 0)

(e.g. the April 2011 update incorporated new signals like sites that users block) uses block whats that?

If you are signed in Google, you get an option on Google SERPs to block a particular site from search results. The option usually appears next to the site you visited when you click back to SERPs.