Well we must wait if the new currency of Facebook will be a cryptocurrency or will be a token, for the market capitalization I do not doubt that it is high, due to the number of users that moves the facebook.
And the money collection for facebook I do not see it necessary for the simple fact that Facebook has a lot of money, I think Mark Zuckenberg wants to experiment and not miss the game with the Blockchain technology, so it is clear that it can not replace or compete with Bitcoin because it does not have any millionaire support that establishes it, in order to compete against bitcoin, but it will use its technology to increase not only the stocks in the Stock Market, but it will also raise money, very much to be able to execute any action that it has in mind.