For Twitter, I like SocialBro, an essential metrics tool.

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As my colleague Kashmir Hill notes, Facebook made some progress in that effort with the introduction of a new metrics tool that seems designed to show page owners exactly how much more reach their posts could achieve with paid promotion.

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The basic concept is an eating tool that measures three metrics -- how long you eat for, how long between each mouthful and how many of them you take.

ENGADGET

While Facebook has impressive metrics, Facebook has yet to prove how it can transform itself into a platform or infrastructure beyond a tool to connect friends with each other.

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