Messaging app Viber has turned on end-to-end encryption for over 700 million users, as the debate over encryption and data privacy continues to evolve.

Thousands of refugees determined to flee life-threatening situations continue to arrive in Europe daily, many using social media and Google Maps to help cross borders and avoid trouble.

Facebook's announcement it is paying $19 billion in cash and stock to acquire WhatsApp is a milestone in the short history of mobile messaging apps.