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}} Slack is a team collaboration tool co-founded by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov. Slack began as an internal tool used by their company Tiny Speck in the development of Glitch, a now defunct online game. Slack was launched in August 2013, and signed up 8,000 customers within 24 hours of launch. ==Funding and growth== The company originally raised nearly $43 million in April 2014. In October 2014, the company raised $120 million in venture capital with a $1.2 billion valuation led by Kleiner Perkins Caufield & Byers and Google Ventures. Earlier investors Andreessen Horowitz, Accel Partners and The Social+Capital Partnership also participated in this round. In March 2015, Slack signed a deal with investors to raise up to $160 million in a funding round that values the company at $2.76 billion. New investors include Institutional Venture Partners, Horizons Ventures, Index Ventures and DST Global. In April 2015, the company raised another $160 million. Slack has experienced rapid growth since it was first released. In February 2015, the company declared that it was adding around 10,000 new daily active users each week, and had more than 135,000 paying customers spread across 60,000 teams. By April, those numbers had grown to 200,000 paid subscribers and a total of 750,000 daily active users. In 2015, Slack passed more than a million daily active users. The Financial Times wrote in March 2015 that Slack was the first business technology to have crossed from business into personal use since Microsoft Office and the BlackBerry.〔http://www.ft.com/cms/s/0/bd7dbf46-d24c-11e4-9c25-00144feab7de.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Slack (software)」の詳細全文を読む スポンサード リンク
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