It's a small wonder nonetheless, knowing that Sunstein, along with Thaler, is the leading figure in paternalistic libertarianism. He goes that to prevent falsehood to spread, we need to create a "chilling effect" against rumors through law.
But actually I like what he describes as (overly) optimistic market-for-ideas solution when he write:
"Perhaps the Facebook generation and its successors will treat a wide range of rumors, including negative and vicious ones, with bemusement or a yawn."This is spot-on.