@aram I don't think I buy this. Was someone a collaborator for living in Germany in 1943 and using the postal system to send domestic mail? Or buying a train ticket? I think for most if its users Twitter is like a kind of utility. I wouldn't be alarmed at my babysitter using Twitter any more than I would if they shopped at Whole Foods. That's not to make an equivalence between Billionaire M and Billionaire B -- they're not equivalent -- but rather just to say that when someone runs a ubiquitous service, and any individual usage of that service represents an infinitesimally miniscule quantum of association between the user and service, then that association is not automatically amplified by the magnitude of the owner's odiousness.

I don't like Twitter either; I wish people wouldn't use it; I avoid it myself now in order to not contribute to the network effect. But that doesn't mean that when someone uses it that are suddenly a Nazi collaborator. If you manage to avoid all such people, it will inevitably mean shrinking your social circle drastically --and many fine & strong resistors will turn out to be outside that circle.