"What is WhatsApp? WhatsApp is a mobile messaging service that functions as a kind of a social network. WhatsApp users can send messages to one or many recipients at the same time, and they can even share their locations.
In many ways, WhatsApp's users are just the kind of customers Facebook is looking for. They are extremely active, sending more than 600 million photos a day -- more photos than Facebook (FB, Fortune 500) users upload. A whopping 70% of WhatsApp users are active every day. By way of comparison, 62% of Facebook users are active daily.
People around the world send 19 billion WhatsApp messages per day, including 200 million voice messages and 100 million videos."* The Young Turks hosts Cenk Uygur and Ana Kasparian break it down.