36: Wikipedia

For Tapping into the World's Collective Knowledge with a Radically Collaborative Online Encyclopedia

Wikipedia is a free multilingual online encyclopedia launched in 2001. It changed publishing by putting the power to write, edit, update and govern information in the hands of the public. It has become one of the most popular and relied-on resources around the world, with a crowdsource format that allows anyone with a computer to contribute. The website is written in hundreds of languages. It has generated nearly 6 million articles in English alone.
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