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StumbleUpon is a discovery engine (a form of web search engine) that finds and recommends web content to its users. Its features allow users to discover and rate Web pages, photos and videos that are personalized to their tastes and interests using peer-sourcing and social-networking principles. Toolbar versions exist for Firefox, Google Chrome, Opera, Internet Explorer and Safari. StumbleUpon also works with some independent Mozilla-based browsers. Native mobile StumbleUpon apps exist for Windows,〔(【引用サイトリンク】title=StumbleUpon for Windows 8 and Windows RT )〕 iOS,〔(【引用サイトリンク】title=StumbleUpon for iOS )〕 Android,〔(【引用サイトリンク】title=StumbleUpon on Android Market )〕 and the Amazon Appstore.〔(【引用サイトリンク】title=StumbleUpon for Amazon Appstore )〕 ==History== StumbleUpon was founded in November 2002 by Garrett Camp, Geoff Smith, Justin LaFrance and Eric Boyd during Garrett's time in post-graduate school in Calgary, Canada. The idea of creating a company was established before the content: of the five or six ideas for products, StumbleUpon was chosen. Garrett describes in a BBC interview the moment for him in which he felt the company had really taken off: "When we passed the half a million mark (in registered users), it seemed more real." The popularity of the software attracted Silicon Valley investor Brad O'Neill to take notice of the company and assist with a move to San Francisco, as well as bringing in subsequent fund-raising totaling $1.2 million from other angel investors including Ram Shriram (Google), Mitch Kapor (Mozilla Foundation), First Round Capital and Ron Conway. Garrett Camp and Geoff Smith now reside in San Francisco, where StumbleUpon is headquartered. StumbleUpon was owned by eBay from May 2007, when it was acquired for $75 million until April 2009, when Garrett Camp, Geoff Smith and several investors bought it back. StumbleUpon is now an independent, investor-backed startup once again, with offices in San Francisco and New York City. In September 2012, StumbleUpon released an update for its iOS app that brought the new feature "StumbleDNA," which aggregates content that is recommended for you, trending content as well as a section where you can view the activity of your StumbleUpon connections. On September 25, 2012, StumbleUpon released a redesign of its website in beta, and extended it to all users on October 24. On January 16, 2013, StumbleUpon confirmed it had laid off 30% of their staff from 110 to 75 employees. 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「StumbleUpon」の詳細全文を読む スポンサード リンク
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