Even on Friday, complaints to Facebook moderators about a group that appeared to encourage arson attacks on 5G masts received replies saying the page did "not violate our community standards" - although after the BBC contacted Facebook's press office it was taken down.
In normal times, social media platforms are very reluctant to curb what they regard as an essential part of their mission: giving people the right to free expression, however outlandish or unscientific their views.
But these are not normal times.
The government is effectively waging a war against a deadly virus, and keyworkers looking after vital infrastructure are facing abuse, possibly inspired by these social media campaigners.
That means there is now intense pressure on the likes of Facebook, YouTube, TikTok and Twitter to combat what one minister has called "dangerous nonsense" - and they will want to be seen to be acting responsibly, even if some of their users cry censorship.