Facebook has announced Social Graph, a tool that lets users search their contact list for specific people, places, photos or interests. Experts say the feature is useful, if somewhat limited, but will gain utility -- and appeal to advertisers -- as Facebook draws more data into its social web. "It is not aimed at toppling Google from its perch as the king of Web search any time soon. Instead, it is the opening round in a long-term campaign to erode Google's monopoly over the most powerful and profitable business on the Internet," Miguel Helft writes.
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