Travel advertisers spent three quarters of a billion dollars on Google AdWords in the U.S. last year, according to AdGooroo’s annual review of AdWords activity in the U.S. travel sector. Nearly 12,700 travel advertisers competed for visibility on more than 50,000 keywords. Booking.com captured more impressions on Google AdWords desktop/tablet in the U.S. than any other travel advertiser, surging to the top spot from number seven in 2012. Based in Amsterdam, and owned by Priceline, Booking.com invested heavily in U.S. television ads as well last year as it makes a play beyond its European foothold. AdGooroo says Booking.com was the second highest-spending company among all paid search advertisers in both the UK and France last year. With Priceline.com, Booking.com and Kayak.com, Priceline-owned sites accounted for over 2 billion impressions, or more than 35 percent of the impressions earned by the top ten travel advertisers in 2013. Get the full story at Search Engine Land Read also "Booking.com, TripAdvisor, Priceline.com Dominate Paid Search in Travel" at ClickZ