WhatsApp was acquired sometime in February for a whopping $19 billion in cash with an impressive 450 million users in tow. However, Facebook CEO Mark Zuckerberg believes that the text messaging app still has a lot of potential to grow, something he believes can reach as much as the billions.

And considering that WhatsApp will be getting opportunities and resources from the leader of social networks, those numbers could be modest. Though it does not necessarily follow that WhatsApp would be integrated with Facebook, the same method and philosophy plus resources added to the mix can make that forecast pretty much achievable.

Taking on the responsibility of bringing the internet to everyone on the planet, WhatsApp can indeed become that niche. Just consider the fact that the app has already reportedly grown to 600 million as of last month, the time frame alone (counting roughly six months) and matching it with Zuckerberg’s forecast seems like a stroll in the park.

And apparently, all these plans are not solely for the benefit of WhatsApp but for Facebook as well. With more people connected to the web, such provides more space for Facebook to grow. At the moment, Facebook has about 1.3 billion active users, so you have to wonder what kind of numbers Zuckerberg has in his mind.

Regardless of that thought, Facebook CEO is willing to go as far as spending to make it all happen. And that includes spending billions of dollars over the next decade which may get some of Facebook’s board members asking, “Where is the money in all of this?”

Apparently, Zuckerberg sees it all coming in if and when WhatsApp and Facebook succeed in his forecast, an improved economy which would translate into better business, Facebook and WhatsApp included.