20 most useful social networking sites

For both work and pleasure, these 20 social networking sites are the most useful to any busy IT professionals.
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Don't have enough time to go looking for news and information or even to e-mail friends and colleagues? If so, then try using social networks. We've selected 20 of the most useful social networks for IT professionals. And these networks aren't just for work, either; some of them will help you find old friends and colleagues, keep in touch with family and friends, and get useful news and information for your busy professional life.

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