The most popular apps!

Since App Stores were introduced, App downloads are rising up to a number of billions.

Therefore the question arises, which apps are the most popular.  

The first place isn´t a surprise: Facebook is the most downloaded app of all time with the Facebook Messenger app in the number two position.
Besides there are more social media apps in the Top 10: Instagram, Skype, Whats App and Twitter.

Also: Youtube, Google Maps and iTunes have great popularity!