WhatsApp says it now has 600 million active users

In the battle of instant messaging apps, everyone is chasing WhatsApp. There is good reason why Facebook decided that WhatsApp was worth $19 billion. Today, WhatsApp CEO and founder Jan Koum sent out a tweet to remind us all why WhatsApp is so valuable: it now has 600 million active monthly users.

The last time we heard from Koum was back in April, when WhatsApp hit the 500 million active users. For comparison, around the same time, Facebook announced 200 million active monthly users of its Messenger app. So, at this point, Facebook must have well over 800 million total active ...