It's the go-to site for information on just about everything but until recently Wikipedia has mostly avoided the battles over abusive behaviour and fake news that have plagued the social media giants.
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Now, just as a new chief executive takes over, a bitter dispute has erupted between volunteer editors of the online encyclopedia's Chinese language edition over how events in Hong Kong are portrayed.
This week's Tech Tent asks whether Wikipedia can continue to prosper in the era of misinformation.
The dispute over Hong Kong centres on a key principle of Wikipedia, as Selina Cheng, of the Hong Kong Free Press, explains to the programme: "Wikipedia does not allow original reporting. So whoever wants to add or edit content on Wikipedia articles has to cite existing sources, for example, government releases or press reporting."
But those sources have to be designated as reliable - and here there was violent disagreement between one group of volunteer editors who saw the Chinese government as a reliable source and another, mainly based in Hong Kong, which preferred to rely on the accounts of protesters.
Selina Cheng says there was a lot at stake because some editors had access to sensitive personal information which could be of interest to the Chinese authorities: "There were fears that, because there was this increasing tension among editors from these different geographical locations, some administrators might abuse their access to use that personal information against certain editors."
This week, the Wikimedia Foundation banned seven editors linked to a mainland China group, which it accused of trying to advance the interests of the Chinese state by infiltrating the encyclopedia.
The move came as the foundation, which oversees the non-profit encyclopedia project, announced the appointment of its new chief executive.