Yet the social network as a concept that moved from one monopoly to another is a fad that is dieing. It certainly seems likely companies that have gotten their start from VR will succeed in collecting a lot of money and possibly diversifying successfully, but will VR end up being more useful than a FB style social site?
The basic problem with VR for me is that second life showed some potential that isn't going to happen because it is socially positive and a lot of negatives that make me want to kill VR as a medium before I have to deal with FB owning real estate in it.
FB has basically created the bifurcation that will limit the future of all new mediums. Half your friends will never use anything they participate in making the concept of social X a disaster for any X.