Sure, but still in Google/Facebook case there’s a centralized backend that does the day to day operations that you invoke from your laptop. In Dropbox case, it is just a local git repo that you push to server only when you want to land a change; just like whatever one does with GitHub, but quite a big one, so the use case is quite different from F/G, which is what I was getting at. In principle maybe you could do it, that’d require quite a big investment in effectively rebuilding mercurial though.
