...think about the mode people are in when they use Pinterest. A primarily visual social network and search tool, its 47 million U.S. users treat it largely as as place for gathering ideas for projects and plans, from recipes to vacations to home renovations. The vast majority of these projects involve spending money. You can't say the same about reading breaking news on Twitter or looking through a friend's baby photos on Facebook.
Pinterest users are already buying the things they see there, of course, and 80 percent of them are even doing it through their phones. The button is just a way of ensuring that Pinterest gets a cut of the action.
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