StumbleUpon is a discovery engine that finds the best of the web, recommended to each unique user. It allows its 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, Mozilla Application Suite, Google Chrome and Internet Explorer, but StumbleUpon also works with some independent Mozilla-based browsers. Third party toolbars have also been created for Safari and Opera
StumbleUpon uses knowledge of user preferences to deliver targeted advertising. A small proportion of the "stumbles" users come across (typically less than 2% are sponsored pages matching their topics of interest. For example, those signed up for photography will occasionally see an ad related to photography. Such content is vetted by humans for "quality and relevance" prior to its delivery. A sponsored site is identifiable by a green "person" logo on the toolbar. Paid accounts (referred to as "Sponsors") have a variety of options, including the ability to turn off such advertising.
Digg is a social news website. Formerly, the site's cornerstone function consisted of letting people vote stories up or down, called digging and burying, respectively, but as of Digg v4, the "bury" function has been removed. Digg's popularity has prompted the creation of other social networking sites with story submission and voting systems. The website traffic ranked 113th by Alexa.com as of September 1, 2010
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