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Tumblr (stylized in its logo as tumblr.) is a microblogging platform and social networking website founded by David Karp and owned by Yahoo! Inc. The service allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs, as well as make their blogs private.〔(【引用サイトリンク】url=http://www.businessinsider.com/these-19-social-networks-are-still-bigger-than-google-2011-7#10-tumblr-the-popular-social-blogging-platform-681-million-10 )〕 Much of the website's features are accessed from the "dashboard" interface, where the option to post content and posts of followed blogs appear. As of November 1, 2015, Tumblr hosts over 261 million blogs.〔 The company's headquarters is in New York City. Yahoo! announced its intention to acquire Tumblr on May 20, 2013, for approximately $1.1 billion.〔(【引用サイトリンク】title=Yahoo takes big leap with $1.1B deal for Tumblr )〕〔(【引用サイトリンク】title=Yahoo CEO Marissa Mayer Buys Tumblr–Her Boldest Move Yet )〕〔(【引用サイトリンク】title=Yahoo! Acquires Tumblr for $1.1 Billion )〕 The deal closed on June 20, 2013. ==History== Development of Tumblr began in 2006 during a two-week gap between contracts at David Karp's software consulting company, Davidville (housed at Karp's former internship with producer/incubator Fred Seibert's Frederator Studios which was located a block from Tumblr's current headquarters). Karp had been interested in tumblelogs (short-form blogs) for some time and was waiting for one of the established blogging platforms to introduce their own tumblelogging platform. As no one had done so after a year of waiting, Karp and developer Marco Arment began working on their own tumblelogging platform. Tumblr was launched in February 2007 and within two weeks, the service had gained 75,000 users. Arment left the company in September 2010 to focus on Instapaper. In early June 2012, Tumblr featured its first major brand advertising campaign in conjunction with Adidas. Adidas launched an official soccer Tumblr blog and bought placements on the user dashboard. This launch was only two months after Tumblr announced it would be moving towards paid advertising on its site. On May 20, 2013, it was announced that Yahoo! and Tumblr had reached an agreement for Yahoo! to acquire Tumblr for $1.1 billion in cash.〔(Yahoo to buy Tumblr for $1.1 billion: Report ), CNN.com. Retrieved May 21, 2013.〕〔(【引用サイトリンク】url=http://www.businessinsider.com/yahoos-board-approves-11-billion-purchase-of-tumblr-2013-5 )〕 Many of Tumblr's users were unhappy with the news, causing some to start a petition, achieving nearly 170,000 signatures. David Karp remained CEO and the deal was finalized on June 20, 2013. 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「Tumblr」の詳細全文を読む スポンサード リンク
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