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San Francisco start-up Klout wants to be the official scoring system of the social Web. Sign into it with your Facebook, Twitter or LinkedIn accounts and it'll calculate your Klout score — a figure that considers not only the number of your connections but also who they are and how actively you engage with them. Justin Bieber has a perfect Klout score of 100, but you don't need to have even 0.001% of his 11.6 million followers to achieve a Klout score that will make you feel like you're accomplishing something. And "Klout Perks" such as gift cards and DVDs of new TV shows are sometimes doled out to influential users.

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