Big online travel sites like Travelocity and Expedia, as well as user-review juggernaut TripAdvisor, are relying on social networking to deliver travelers to their sites. According to travel market research firm PhocusWright, social networking is one of the most powerful forces driving travel planning today. The firm found that social media use among travelers is growing far faster than the travel industry itself. Unique monthly visitors to social travel sites jumped 34 percent between the first half of 2008 and the last half of 2009.

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