That's not how Germany sees it though. They will be prosecuting Facebook, Twitter etc directly; albeit that's for hate speech.
The CEOs of these social media companies know full well that allowing these kinds of tweets to circulate has a propensity to lead to real life violence. They're quick to suspend accounts for other kinds of "wrong think", perhaps they should be quick to suspend accounts of those who would seek to make accusations without evidence too.
Yeah but if you ban twitter people will just move to other sites, and they'll be based in other countries, banning things doesn't work. And I wouldn't wish to emulate anything Germany does politically.