The interesting article about Social Innovation in Wikipedia http://en.wikipedia.org/wiki/Social_innovation states:

Social innovation refers to new strategies, concepts, ideas and organizations that meet social needs of all kinds — from working conditions and education to community development and health — that extend and strengthen civil society.

This is interesting, because at the same time the article states:

"Social innovation can take place within government, the for-profit sector, the nonprofit sector (also known as the third sector), or in the spaces between them".

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