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With so many patients to see, prescriptions to write, and e-mails to answer, it can be difficult to find time to catch up with your colleagues over lunch or even for a quick chat in the hallway. As a result, many questions go unanswered and,perhaps more important, individual observations go unshared. So where do busy physicians go when they need a sounding board? Now that social networking Web sites such as MySpace and Facebook have become household words, startup companies have formed online communities that allow physicians to make contacts that they would not have ordinarily made on their own.