I am an active user of WhatsApp and their service is much more reliable than Skype or Hangouts. There&#x27;s a reason why 800 million people are using it and it&#x27;s not only because of network effects, it&#x27;s because the base product and service is rock solid.<p>Their innovation is evolution of WhatsApp past text messages. And in the end, nothing is a true innovation -- most things build on past ideas.