Investigating the Potential for Miscommunication Using Emoji

Apple's initial implementation was designed to operate with SoftBank's Emoji format, and predates unicode standardisation. Their version of this icon can be seen here http://image.slidesharecdn.com/iuc36emojifinal1-131204112121... and Apple's matches it pretty well. [Also note: this is where the Apple's smiley poop comes from too]

The main fault seems to be that the codepoints for those icons were explicitly mapped onto unicode's 'grinning face with smiling eyes', despite them not being representations of that.

The Unicode standard got 'grimacing face' a couple of years later, though, which better suits this expression. [Apple's version uses the same mouth as here, but with normal eyes]

Nice. It seems Twitter cribbed pretty strongly from Apple in their emoji, especially the facial expression ones.