Research by Mobile Time and Opinion Box has revealed that WhatsApp is the most important app in Brazil. A staggering 48% of respondents said that WhatsApp was their most “essential” app, with Facebook coming in at a distant second place at just 9.6%. No other apps were viewed as the “most essential” by more than 2% of respondents. The research also looked at the relative popularity of mobile operating systems. It found that Android was a clear favourite amongst Brazilians, being used by 83% of respondents. iOS was used by 9% and Windows Phone was used by 6%. However, Windows is expected to overtake iOS this year to become the second most popular operating system in Brazil.