Mashpedia a free topic-based encyclopedia that fetches content from many different sources (Wikipedia, Google, Twitter, Digg, YouTube…) to bring you the best results in real-time and in one spot. The site is available in three languages — English, Spanish and Portuguese.
To start using Mashpedia, visit http://www.mashpedia.com and enter a topic of interest in the search box (e.g., new media, Cloud computing, iPhone, World War II, Stephen Hawkins…). You can also click on one of the suggestions. The results page is divided into five categories: Videos, Wikipedia, News, Comments from Facebook, and What’s Hot.
Mashpedia is not a Search Engine: Mashpedia provides content only for specific topics such as concepts, subjects, personalities, events, places, companies, products, etc., but not for broader, unspecific searches.
(Source: About page)