Google trying to launch new features similar to ““Like”” button of Facebook. Use the +1 button to publicly show what you like, agree with, or recommend on the web. The +1 button can appear in a variety of places, both on Google and on sites across the web.
More Information visit… Google +1 Button
Goog point, cooper4. There is already a discussion about this here: http://www.sitepoint.com/forums/industry-news-264/google-1-wants-involve-social-media-into-results-748041.html