Facebook Messenger is now the most popular iOS app with 800 million people using it every month, according to Nielsen. App Annie revealed that Messenger is the fastest growing app of 2015.
Further according to the data, people send more than 9.5 billion photos to friends through Messenger every month. Messenger has been downloaded by more than 1 billion times on Android, it said. The number of users have almost doubled from 500 million in November last year