Mr Costolo had been under pressure from investors unhappy with the firm's user growth.

投资者对推特用户的增长感到失望，科斯特洛也因此饱受压力。

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Dick Costolo, Twitter's chief operating officer, disputes this, arguing that people often use it to search for, say, immediate reactions to product launches.

推特首席实施官员迪克·卡斯特罗与之意见不相伯仲，他认为人们通常用它来搜索，产品发布的第一反应。

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Mr. Costolo has made several other key hires, including from Facebook and News Corp.

WSJ: New Financing Values Twitter As High As $7 Billion

Much of the push to build out Twitter's business comes from 47-year-old Mr. Costolo.

WSJ: New Financing Values Twitter As High As $7 Billion

Previously Costolo was a management consultant, and worked as an advertising product manager at Google.

FORBES: Steve Ballmer's Breakfast With Twitter