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StumbleUpon 是咋选出推荐网页的( 二 )


http://en.wikipedia.org/wiki/StumbleUponHistoryStumbleUpon was founded in November 2001 by Garrett Camp, Geoff Smith, Justin LaFrance and Eric Boyd during Garrett\u0026#39;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\u0026#39;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 investorsincluding 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.Service detailsStumbleUpon uses collaborative filtering (an automated process combining human opinions with machine learning of personal preference) to create virtual communities of like-minded Web surfers. Rating Web sites update a personal profile (a blog-style record of rated sites) and generate peer networks of Web surfers linked by common interest. These social networks coordinate the distribution of Web content, so that users "stumble upon" pages explicitly recommended by friends and peers. Giving a site a thumbs up results in the site being placed under the user\u0026#39;s "favorites". Furthermore, users have the ability to stumble their personal interests like "History" or "Games".Users rate a site by giving it a thumbs up, thumbs down selection on the StumbleUpon toolbar, and can optionally leave additional commentary on the site\u0026#39;s review page, which also appears on the user\u0026#39;s blog. This social content discovery approach automates the "word-of-mouth" referral of peer-approved Web sites and simplifies Web navigation.On October 24, 2011, StumbleUpon deleted years worth of user-generated content, and removed HTML blogging, standalone blog posts, and photoblogging capabilities. Additionally, all previous blog posts were converted from HTML to plain text, and all photos were deleted from previous blog posts. StumbleUpon stated, "Over time, we’ve come to realize that we are not able to support and scale a blogging platform, in addition to our recommendation engine."Content that is "stumbled upon" is informed not only by user\u0026#39;s stated preferences and the thumbs up and down of their friends, as well as demographic information.StumbleUpon VideoOn December 13, 2006, StumbleUpon launched their StumbleVideo site at http://video.stumbleupon.com/. The new site allows users without a toolbar to "stumble" through all the videos that toolbar users have submitted and rate them using an Ajaxinterface. The site currently aggregates videos from CollegeHumor, DailyMotion, FunnyOrDie, Google, MetaCafe, MySpace, Vimeo and YouTube.StumbleUpon launched a version of StumbleVideo for the Internet Channel Web browser that runs on the Wii console on February 12, 2007. This version of StumbleVideo is optimized for the Wii\u0026#39;s smaller screen resolution and offers similar functionality to that of the original version.


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