Priceline (Booking.com) Spends $1.8b per Year on Online Ads

90% of that $1.8b goes to Google AdWords, according to this article:
http://www.businessinsider.com/priceline-ceo-facebook-and-twitter-are-us...

... "Google of course respects us as an advertiser," said Huston, whose company accounts for about 3 percent of Google’s ad revenue.

Priceline owns Booking.com.

See also:
http://www.bloomberg.com/news/2014-04-14/priceline-seeks-results-from-fa...