Priceline spends feverishly on Google advertisements to grab users searching for a hotel in New York or Paris - and because ads on Facebook and Twitter have failed to deliver results, Chief Executive Officer Darren Huston said. “For Facebook and Twitter, we have endless amounts of money,” Huston said yesterday in an interview at Bloomberg’s New York headquarters. “But we haven’t found anything there.” The comments by the chief of one of the biggest spenders on online advertising are set to stoke debate over which forms of digital marketing are most effective. Facebook and Twitter have grappled with questions of whether their social media ads provide a substantial return on investment for marketers, particularly at travel and e-commerce companies. Get the full story at Bloomberg