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That's further affirmation of Twitter's apparent strategy; co-founder Biz Stone said a month ago that he and his colleagues "are definitely not interested in selling the company."
Costolo said he expects revenue growth from a new advertising platform that's coming "very soon," commercial accounts with analytics features for tracking tweets and traffic, and at least 10 more distribution deals in the future. Twitter has drawn some criticism because the company's revenues are low for its $1 billion valuation. That is clearly a concern within the company, and something that needs to be addressed before an IPO. "Now we have to go build the business the business that lives up to that valuation," Costolo said.