The stock exchanges have "circuit breakers"--on a day when there's panic selling and the indices drop through the floor, they can suspend trading to allow nerves to calm down.
Kindergarteners have "time out".
Is it possible we could do something similar with social media? Rather than the drastic remedy of prohibitions, simply slow the twitter storm or whatever. Suppose X has 20 million followers, and he sends out a tweet. Instead of all 20 million receiving it in milliseconds, spread the impact over hours or days.