Twitter, in its second quarterly report since going public, saw its revenue grow 119% year-over-year to $250 million, with about $180 million of that coming from mobile ads. But the service added just 14 million monthly active users in the quarter, bringing its worldwide total to 255 million and U.S. total to 57 million, which shows that it "is still failing to appeal to the mass social-networking audience that Facebook ... has cultivated," writes Cotton Delo.

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