None. Almost by definition, the folks who satisfy themselves waxing online drive complacency away from real action. That doesn’t, however, mean they aren’t self-importantly organized to later support an organized movement.

I know of one crowd sourced witch hunt on reddit:

https://en.wikipedia.org/wiki/Suicide_of_Sunil_Tripathi

A lot of the cancel culture is also crowd sourced on platforms like these.

The online right talk about 'the great meme war' that led to the 2016 election of Trump.

Seems pretty clear that social media is radicalising people at both ends of the political spectrum, and it's not surprising that governments would want to restrict/police it by trying to criminalise 'hate'/'misinformation' and taking away the shield of anonymity.

Donald Trump?