US patent class 709: Electrical computers and digital processing systems: multicomputer data transferring

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How come this is not a duplicate of SMB protocol?

I'm not an expert in patents... but a software engineer who works on network protocols. Just wondering how come this patent is approved because of the similarities with SMB protocol implementation. ...
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Has Facebook patented location checkins, and how could I get around it?

My app features functionality to see where your friends are, pretty much like Foursquare and Facebook do, but the scope and reason why are quite different. In fact, it would be check in / and check ...