Facebook Offers Friends Grouping

The ability to organize “friends” into different groups, with each category assigned its own privacy settings, has now been confirmed by the social networking site. Facebook has stated that it's working on allowing its members to "organize that long list of friends into groups so you can decide more specifically who sees what." No formal announcement was made, but you can see the little tidbit--along with something about forthcoming "daily digest" e-mail options--on the What's New on Facebook page. It’s not only users that will benefit from the new feature, but advertisers — and therefore, Facebook’s bottom line. If users organize their networks into distinct groups, then these groups can be specifically targeted by advertisers. All a natural progression of data mining users’ social graphs in order to enable more efficient marketing.
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http://blogs.zdnet.com/social/?p=319