Google & Bing are making search more social

Google are aware that personal recommendation is powerful, so they are now integrating recommendations from you social connections on sites such as blogger and twitter into the search results. It'll be interesting to see how this pans out and how Google calculate relevance. With regards to calculating relevance Google and Bing say that:

• Public activity on Twitter and Facebook is counted as a signal in search algorithms,
• They calculate authority of social-media profiles,
• Authority is used to weigh the importance of shared links.