How WhatsApp became the world’s default communication app

In 2014, WIRED asked me to write a few lines about my most-used app as part of an internship application. I wrote about WhatsApp because it was a no-brainer. I was an international student from India, and it was my lifeline to my family and to my girlfriend, now my wife, who lived on the other side of the world. “This cross-platform messenger gets all the credit for my long-distance relationship of two years, which is still going strong,” I wrote in my application. “Skype is great, Google+ Hangouts are the best thing to have happened since Gmail but nothing says ‘I love you’ like a WhatsApp text message.”

A few months into that internship, Facebook announced it was buying WhatsApp for a staggering $19 billion. In WIRED’s newsroom, there were audible gasps at this seemingly minor player's price tag. American journalists weren’t ...