Google is copying social media giants?

Google decides Orkut would not make them contend. The way they express their concern and to make even? Add a like button to search results.

This is called collaborative filtering, which has been widely used by Amazon and many other E-commerce.

http://news.cnet.com/8301-1023_3-20067712-93.html

http://news.cnet.com/8301-13577_3-20048886-36.html