Facebook's mobile business is bigger than ever

There's a good reason why Facebook's mobile business is bigger than ever. The majority of Facebook's users now access the social network exclusively on a mobile device, Facebook announced as part of its third quarter earnings.  SEE ALSO: Facebook's Wall Street fairy tale is coming to an end Of its 1.79 billion monthly active users, more than 1 billion are so-called "mobile only" users who only use Facebook on mobile devices. And, by all accounts, it looks like that number is only going to g