Which social media site began correcting factual inaccuracies in posts by political candidates in 2020?

Name: Which social media site began correcting factual inaccuracies in posts by political candidates in 2020?
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Question

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Twitter began labeling and providing warnings on tweets containing disputed or misleading information related to elections and politics in 2020, as part of its efforts to combat misinformation.

Which Social Media Site Began Correcting Factual Inaccuracies in Posts