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The ever-present Facebook like button has seen growth of 34 percent since February in terms of being published to external websites. One would think that 34 percent is a fairly solid growth rate, but it placed Facebook behind Google Plus, AddThis, Twitter, StumbleUpon, and LinkedIn. And all of those social networks were dwarfed by the performance of the Pin This button from Pinterest, which saw growth skyrocket by 637 percent.

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