Priceline Goup, one of the world's biggest online advertisers, has said advertising on social media sites Facebook and Twitter doesn't work.
CEO Darren Huston told Bloomberg: "For Facebook and Twitter we have endless amounts of money, but we haven't found anything there."
A void and avoid. Priceline has an annual advertising spend of almost USD2 Billion, 90% online, and most of that is spent on Google.
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