Here is Gruber's take...
Hill: Facebook, are you doing this terrible thing?
Facebook: No, we don’t do that.
Hill, months later: Here’s academic research that shows you do this terrible thing.
Facebook: Yes, of course we do that.
I agree with Gruber on Facebook being a morally criminal enterprise. Also, I try to avoid Facebook, aside from my wife's usage, at all costs. I'm even leery of Instagram, which is sad because one of my professional hobbies is photography. Gruber says:
At this point I consider Facebook a criminal enterprise. Maybe not legally, but morally. How in the above scenario is Facebook not stealing Ben’s privacy?