Based on what I'm seeing, unrestricted real-time social media (with "likes" and "retweets" and easy commenting) appears to have led to serious violence in some parts of the world. Perhaps based on the tendency to amplify rumours, or even bad jokes, until they are widely believed regardless of truth.

In places where it hasn't resulted in obvious violence, it appears to be pushing people towards polarisation and distress, with violence looking plausible if that continues.

We have a real dilemma around this one. It may be that certain forms of "speech" that have emerged in modern society also push people towards violence.