The Japanese games giant Nintendo has released an app that is taking the world by storm. The next big thing, and new Internet sensation, is an augmented reality game called Pokemon Go. Players must physically move around the real world in order to capture mystical creatures called Pokemon (short for pocket monsters). It was only officially released last week, in the USA, New Zealand and Australia. It is about to overtake Twitter in the number of daily active users and it hasn't even been launched globally yet. Analysts report that in just 48 hours, Go was installed on 5.6 per cent of all Android devices in the USA. On average, users are spending twice as much time on Go than on apps like Snapchat.