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Twitter CEO Dick Costolo addresses a session at the National Venture Capital Association's annual conference in San Francisco, Calif. on Wednesday, May 15, 2013. (Kristopher Skinner/Bay Area News Group)
Twitter CEO Dick Costolo addresses a session at the National Venture Capital Association’s annual conference in San Francisco, Calif. on Wednesday, May 15, 2013. (Kristopher Skinner/Bay Area News Group)
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Twitter, which is set to report earnings today, has been raking in the mobile-ad dollars, so analysts are expecting second-quarter revenue to have doubled to $283 million. But there continues to be concern about the rate at which the social network is adding users.

Analysts expect Twitter user growth of about 20 percent in the second quarter (to 265 million users), according to Quartz, which points out that at this point last year, Twitter user growth was about 40 percent. The Wall Street Journal reported a couple of weeks ago that the San Francisco company is so concerned about showing its service’s reach that it’s going to unveil new metrics that show it’s everywhere you look (TV, celebrities taking selfies at the Oscars and tweeting them), and that even non-users visit the site.

Besides the concerns about growth, CEO Dick Costolo has shaken up the management. Most recently, the company brought a new chief financial officer, Anthony Noto, on board. He’s a former Goldman Sachs exec who’s of course seen as someone who knows what Wall Street wants.

Twitter shares are up 1.5 percent to $38.5o. They’re down about 48 percent since reaching an all-time high of $73.31 in December, and about 10 percent since April, the last time the company reported earnings — and that it had 255 million users.

Photo: Twitter CEO Dick Costolo addresses a session at the National Venture Capital Association’s annual conference in San Francisco on Wednesday, May 15, 2013. (Kristopher Skinner/Bay Area News Group)