Pity the poor smiley face. It once was the go-to symbol to convey e-emotion. Cyberspace was its oyster. It reigned supreme. But today's mobile app era has become something of an emoji-eat-emoji world.

When it comes to IRL facial expressions, most people can do a pretty good job deciphering the message someone is conveying by their beaming smile or disappointed frown. But, in the world of emojis, ...