https://www.theguardian.com/technology/2018/jul/17/bitmoji-emoji-avatar-app-downloaded-ios-apple-facebook

The co-founder of the most downloaded iOS app of 2017 welcomes competition from big tech

It might not be marked in your diary, but 17 July is World Emoji Day. Why? Because, if you’re on an Apple or Google platform, that’s the date the calendar emoji shows.