WhatsApp? As it turns out, plenty.
Expect growth in the use of WhatsApp Messenger in the coming years, according to investment analyst firm MKM Partners.
The app, acquired by Facebook in February for $19 billion, is a cross-platform mobile messaging app that allows users to exchange messages without paying for SMS, according to the company's website.
The app is available for iPhone, BlackBerry, Android, Windows Phone and Nokia. Yes, those phones can all message each other, but because WhatsApp Messenger uses the same Internet data plan used for Web browsing and email, there is no cost to message co-workers or friends.
MKM writes that WhatsApp will be the "primary communications tool" among users for many years, perhaps decades.
They say messenger apps will potentially serve as the "sustainable underlying service layer" that helps to "solidify Facebook's position" among competitors.
MKM also predicts that Instagram monetization will pick up in 2015 and be a "significant contributor" for Facebook in 2016 and 2017.
And, while video has been a "negligible contributor" to Facebook's revenue growth to date, MKM said it believes that video could be the "largest growth driver" for Facebook during the next decade.
Number of Instagram users; surpassing Twitter's 284m