When Facebook (NASDAQ: FB) acquired WhatsApp in 2014, CEO Mark Zuckerberg set a threshold for when the social network would begin seriously thinking about monetizing the popular messaging platform: 1 billion users. That was more than double the 450 million monthly active users (MAUs) that WhatsApp had at the time of acquisition. It’s now been just over a year since WhatsApp hit the 10-digit threshold, but investors still have yet to see any semblance of financial results from the acquisition.