The grinning face example is out of date now. https://emojipedia.org/grinning-face-with-smiling-eyes/ https://emojipedia.org/grinning-face-with-smiling-eyes/ Ap

The grinning face example is out of date now. https://emojipedia.org/grinning-face-with-smiling-eyes/ https://emojipedia.org/grinning-face-with-smiling-eyes/ Apple switched to a happy face in iOS 10, and Twitter switched at some point too. Given the timing, it might've been a direct response to this paper. Historically, this issue stems from it being an original DoCoMo emoji. https://d2jv9003bew7ag.cloudfront.net/uploads/Original-Emoji-Set-1.jpg https://d2jv9003bew7ag.cloudfront.net/uploads/Original-Emoji... My understanding is that when Apple was implementing these, read the bottom left graphic here as rectangular by choice. At 12x12, it's pretty ambiguous. Then Unicode got into the mix, called it a 'grinning face', and newer sets went in that direction.