What was it: Knols were authoritative articles about specific topics, written by people who know about those subjects.
According to the company’s post on the official blog: 'Knol was supposed to encourage experts to contribute their knowledge online and make it accessible to everyone.'
Many saw knol as Google’s attempt to compete with Wikipedia.
Why was it discontinued: Google phased out Knol in favour of Annotum.
When: All the content was deleted by October 2012.
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