It is one of the 12 most visited websites in the world, indispensable to millions of users. From Aa ('an 80km river in northern France') to ZZ Top ('an American blues rock band'),online encyclopedia Wikipedia has entries on just about everything.
But last week the website was engulfed in controversy after it was revealed that one of its main contributors had faked his qualifications.
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The scandal has thrown the authority of the encyclopedia into doubt. Critics argue that anyone with access to the internet is allowed to edit the entries, though Wikipedia insists that the sheer number of users ensures errors are swiftly corrected.
But not everyone is convinced. Here, four well-known personalities examine their own entries on the website and give their verdicts...
