"The influence of social networking and community services is growing significantly for online travel, " says Douglas Quinby, senior director of research at PhoCusWright.

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Reddit is a great example of a site that has become far more than simply a social-networking or link-sharing utility and has grown into a real online community that can get things done.

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The Boss Network: A community of entrepreneurial women who support each other through conversation, online and event-based networking.

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While TripAdvisor is currently the number 1 online travel community in North America, Europe and Asia-Pacific, it implicitly competes with large social networking sites like Facebook and Twitter which also offer a forum for users to discuss travel plans and exchange reviews.

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