I think the line he is trying to draw is this: Scenario 1: I am a facebook user that wants to say something that people find offensive. I may write or share an

I think the line he is trying to draw is this: Scenario 1: I am a facebook user that wants to say something that people find offensive. I may write or share an article I found online to "support" my views. This is allowed under the idea of Free Speech. Scenario 2: I am some entity that wants to generate controversy and polarization by gaming recommendation algorithms, and thus flood the space of discourse with offensive material. I don't care about the material itself less so than the vitriol and outrage. AKA "Fake News". This is what they want to ban. What trolls have done is essentially "hacked" the idea of Free Speech. The original idea behind Free speech was that people would at the very least earnestly believe what they were saying, or at the very least were engaging in satire. Trolling is satire on a whole new level, and it does seem truly difficult to separate the two without being too draconian.