The top ten Android apps in the world last year had a combined download figure of 3.6 billion. According to Priori Data
, at the top of the list was the hugely popular WhatsApp
with 747 million. In fact, apps developed by Facebook account for the lion's share of the list, with WhatsApp, Instagram, Messenger/Messenger Lite and Facebook/Facebook Lite notching up a combined 2.5 billion downloads.