If you encounter a troll on twitter, considering muting them rather than blocking. You further waste their time this way as they don't know that you cannot see what they are saying, which means they are likely to continue to send more vitriol to you believing you see it, when really they are shouting into the void. This acts as a heatsink, as they waste time ineffectually screeching at you, they dont go after others as quickly. Widespread use of this will reduce the overall effectiveness of trolling on Twitter over time and does not give trolls the satisfaction of being blocked, which some of them view as "winning".

Further expansion of muting functionality to other social media platforms and the abolishment of hard-banning except in exceptional circumstances is the most effective technological solution to trolling and harassment, without infringing in any way on the concept of freedom of speech, even the most outrageous and inaccurate interpretations of the notion. Freedom of speech never was and has never been a way to force someone else to listen to you. That is quite literally infringing on the freedoms of other people. You can say whatever you want, but nobody is obliged to listen to it.

If you doubt the effectiveness of this measure, consider that even though I have had YT comments turned off for 3 years, allowing people to post them where no-one else can see them has still resulted in people "gettings things off their chest" and not yelling at a real person instead. It's the equivalent of yelling at the TV. It makes you feel better, but its harmless. My Lawbreakers video had over 300 comments on it, that nobody will ever read. They will sit in the approval queue forever, alone.