"We're not censoring -- just downranking and redirecting you to Snopes" is rapidly becoming Silicon Valley's go-to answer to charges of censorship or playing arbiter of truth. newsroom.fb.com/news/2018/08/h… 
The basic problem is that the strongest cases for making FB/Tw/G arbiters of truth is that they're now serving the role of editors, but they're doing everything possible to deny that their own judgment is part of their content decisions, which is definitive of the editorial role.
Editors are great. We need more of them. But real editors claim decisions as theirs; they voice reasons for which they're accountable. Farming this work out to Snopes or Politifact, downranking, invoking neutral principles arbitrarily, is SV's way of avoiding that responsibility.
The dual conceits of Twitter and FB News as at once gateways/forums/public squares *and* publishing platforms controlled by editors is inherently conflicted and incoherent. I see no way to square this circle.
