Sir Richard Branson and Sir Tim Berners-Lee have teamed up with Google to discover Britain's most innovative social entrepreneurs.
The duo are members of a judging panel in a competition looking for not-for-profit organisations which could use technology to change lives.
The stand-out candidates will be chosen for Google's £2 million Global Impact Challenge, which will award the four strongest contenders £500,000 each, and computers to help them on their mission.
Applications opened today at globalimpactchallenge.withgoogle.com and 10 finalists will be selected in May, with the final taking place in June.
Sir Richard said: "I am a great believer in the power of entrepreneurs to solve key problems and improve lives through a combination of free thinking and the intelligent use of technology.
"Google's Impact Challenge is a brilliant way to spark a new wave of innovation amongst non-profit foundations and charities and raise the profile of many great ideas in the non-profit sector."
The panel is completed by Google vice-president for northern and central Europe, Matt Brittin, Jilly Foster, founder of campaigning agency Forster Communications, and Jacquelline Fuller, director of Google Giving.
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