It was just about 6 weeks ago that WhatsApp announced that it had hit 250 million active monthly users, and about 7 weeks since WhatsApp announced 27 billion daily messages processed. Today, it has announced that the service now has 300 active monthly users, and that it processes 11 billion outgoing messages and 20 billion incoming (the difference is due to group messaging.
To mark the occasion, WhatsApp has started rolling out updates that add voice messaging to its apps. And, we're not just talking about updating the major platforms, but all of the apps on iPhone, BlackBerry, Android, Windows Phone, and Nokia. So, check your app stores for the update.