Google moves to trash content farms -

Google has decided to cause more controversy.

It's announced that it's changed its search algorithm, which will ruffle the feathers of content aggregators  by affecting 11.8 percent of search results.

According to Google search engineers Amit Singhal and Matt Cutts the changes have been made in a bid to "reduce rankings for low-quality sites—sites which are low-value add for users, copy content from other websites or sites that are just not very

They claimed that at the same time the changes would also give "high-quality sites", or those with original content and those that provide analysis and in-depth reports, a better ranking.

Both co-wrote a blog post in which they claimed: "Our goal is simple: to give people the most relevant answers to their queries as quickly as possible. This requires constant tuning of our algorithms, as new content—both good and bad—comes online all the time.

"We can’t make a major improvement without affecting rankings for many sites. It has to be that some sites will go up and some will go down. Google depends on the high-quality content created by wonderful websites around the world, and we do have a responsibility to encourage a healthy web ecosystem. Therefore, it is important for high-quality sites to be rewarded, and that’s exactly what this change does.

"It’s worth noting that this update does not rely on the feedback we’ve received from the Personal Blocklist Chrome extension, which we launched last week. However, we did compare the Blocklist data we gathered with the sites identified by our algorithm, and we were very pleased that the preferences our users expressed by using the extension are well represented.

"If you take the top several dozen or so most-blocked domains from the Chrome extension, then this algorithmic change addresses 84 percent of them, which is strong independent confirmation of the user benefits."

They added that to start with the company would be launching the change in the US, but it would be rolled out to other countries in time.