Pinterest spikes 17% as monthly active users top 300 million for the first time (PINS)

Shares of Pinterest soared 17% in early trading on Friday after the social network reported second-quarter earnings that pleased Wall Street. 
Pinterest reported that monthly active users, one of the most important metrics for analysts and investors, surpassed 300 million for the first time. 
The company also posted $261 million in revenue, a 62% increase from the same period last year. 
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