You heard about the Twitter news from Bing and Google but did you see the video demo from Google's Marissa Mayer on how Google will handle searches within the social network of an individual? If Google knows who your friends and family are, they can make image search, product search, web search, much more personalized.
Want to see how? Check out this video of Google's Social Search labs project that hopefully will launch in the next couple of weeks.
For many, handing over such data to Google can seriously improve the 'relevancy' of many of their search queries. But those worried about privacy should realize that for Google to get this information, you probably need to provide it.
Forum discussion at WebmasterWorld.
