Yahoo announced that they will be adding social updates to search results based on your user address book.
These activity streams will link Yahoo and Facebook (who already have a partnership) to distribute updates and content comments within social circles.
The new features may be very related to the new Facebook "Like" button or Twitter's @anywhere attribute.
An FT blogger expressed cynicism about Yahoo's ability to launch such features--saying that Yahoo has been talking about such additions for the past 6 years with no progress. Search Engine Watch also criticized the idea by saying that the feature will not add value for users, but is just simply jumping on the hype bandwagon.
Source:
Yahoo wants to do what Facebook did, only slower
https://blogs.ft.com/techblog/2010/04/yahoo-wants-to-do-what-facebook-did-only-slower/
Yahoo to Add Twitter & Facebook Updates to Search Results
https://blog.searchenginewatch.com/