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On July 17th, Plussem.com launched their website offering to provide fake +1s for your website for a fee.

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Like buying links, this service offers fake user endorsement of your site – potentially improving your ranking in the Google search engine.

It’s hard to know if Google will be able to detect this without knowing how Plussem actually generate the +1s? 

I’m sure Matt Cutts and the Google web spam team are working on ways to detect and ignore these fake endorsements, but if the spamming grows, it may affect how much +1s affect the ranking signals.