Twitter has announced that it will start alerting users when a tweet makes disputed or misleading claims about the coronavirus.

The new rule is the latest in a wave of stricter policies that tech companies are rolling out to confront an outbreak of virus-related misinformation on their sites. Facebook and Google, which owns YouTube, have already put similar systems in place.

Some of the questionable tweets will run with a label underneath that directs users to a link with additional information about Covid-19. Other tweets might be covered entirely by a warning label alerting users that “some or all of the content shared in this tweet conflict with guidance from public health experts regarding Covid-19.”

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