Twitter in the fourth quarter expects to have in place hundreds of clients for its new "Promoted Tweets" program, and this summer will unveil a commercial accounts business, Chief Operating Officer Dick Costolo said. "We were valued at over a billion dollars last September, so we're going to live in a world where we need to be generating hundreds of millions of dollars in revenue," he said. "We're thinking about big, big numbers." However, Costolo did not forecast a date for when the microblog would turn a profit.
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