The iphone is the world's most popular smartphone. what were the most popular iphone apps of 2017? Last year's most downloaded app, Snapchat slipped from #1 to
#2 in 2017. Facebook, Instagram & YouTube were all strong at #6, 5, & 3 respectively. So, what was 2017's most downloaded iphone app? Mashable reports it was Bitmoji. Click here for the top 20 of 2017.




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