Great perspective from Mark Cuban, but I believe that Facebook has untapped opportunities in mobile and they will figure out how to monetize it. People used to have the same argument for Facebook in general. As more people become comfortable with location-based services Facebook will be primed to take advantage and that is only one opportunity available.

I do agree that Facebook has as good a chance as anyone to monetize mobile well.

I posted about the Mobile Social Stories experiments they're doing.

I believe they have a dozen other monetization experiments planned for the near-future, too.