now features more than four million reviews and opinions from travelers around the globe. In addition, TripAdvisor has become the third most visited travel site in the world, according to worldwide January data recently released by comScore Media Metrix. Nearly 19 million people visited in the month of January.

"These growth milestones reinforce our position as an essential tool for marketers who are targeting an extremely desirable and highly-qualified audience," said Steve Kaufer, chief executive office of TripAdvisor. "We are grateful to the millions of travelers around the world who have chosen for their travel planning and who share their advice every day with fellow TripAdvisor travelers."

TripAdvisor recently launched graphical advertising, adding another vehicle through which travel agents, suppliers and other marketers can reach a highly qualified audience of nearly 19 million travelers each month. The company has retained the Travel Ad Network (TAN) as the exclusive advertising representative for this new offering, specifically, IAB standard 728x90 and 300x250 "banner" ads. TripAdvisor also offers a successful cost-per-click marketing platform through its internal sales force, allowing customers to pay only for leads, not impressions, with every campaign.