Obviously there's a spectrum of responsibility, with some companies bearing more and others less. The grocery store is a poor analogy though because they're not

Obviously there's a spectrum of responsibility, with some companies bearing more and others less. The grocery store is a poor analogy though because they're not actively facilitating tomatoes being thrown. If they incentivized tomatoes being thrown through social mechanics then I would place more blame on their shoulders. Also you're talking about current law here. I'm not interested in the current state of affairs. I understand Twitter and Facebook aren't breaking the law if they facilitate organization of a genocide. I'm talking about what should be the case. Perhaps laws need to be updated.