It's hard to imagine any 55-employee business that's worth $19 billion -- no matter how disruptive it is. Yet that's the price -- including the value of common stock and restricted stock units -- that Facebook (NASDAQ:FB) has agreed to pay for the five-year-old cross-platform messaging service, WhatsApp.

So where's the value in the deal? In the video below, Fool contributor Daniel Sparks suggests that investors look to two facts. First, WhatsApp's total messaging volume is already approaching the entire global telecom SMS volume. And just how valuable is this market? That prompts the second fact: according to The Verge, SMS is a $100 billion a year industry globally.

Check out the video below to hear more about how Facebook is positioning itself in this market with the acquisition of WhatsApp.