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From wired.co.uk/article/wikipedia-fake-news-disinformation:
while other platforms are mired in debate over the borders between free speech, propaganda and trolling, Wikipedia has taken a different route from the onset: community-driven fact checking. One of the platform’s three core policies is “verifiability, not truth”, and it requires every claim on Wikipedia be attributed to a reliable source. Any question on the meaning of “truth” is deemed moot: either you have a source for your claims, or you don’t. (Wikipedia editors have even debated whether the claim that the sky is blue needs a citation or not.) The resulting debate is much less politicised than the one taking place on social media. Wikipedia’s community standards have created the conditions for a shared reality.