Definition: On February 24, 2011 Google implemented a search engine algorithim change that is affecting nearly 12% of USA search results.
There was a purge of sites from search engine results that were generating revenue from what Google saw has producing low quality content. These are often known as "content farms" or "content mills."
Search engines view their users as customers. They want to deliver truthful and valuable content in order to keep their customers. Many speculate that this algorithim change was determined by data that Google collects and the results that were purged were sites that searchers land on, but leave immediately.
The results of this change was small sites losing search rankings and some losing literally all of their search engine results page visibility - meaning they can no longer be found by search.
Also Known As: Google Farmer Update
