Another interesting angle to ponder is what this could do to websites hosting open comment sections on the web. Already a bit under fire for having low quality in many cases, I could see a lot of places taking down their comment sections if it's also going to open them to litigation. It doesn't take many lawsuits before the benefit the comment sections may be bringing is outweighed.

I say this without judgment as to whether that would be good or bad; just musing about the second-order consequences.