Of the six billion emoji that are sent globally every day, around 70% are emotion based – for example, smiley face, love hearts. A smaller proportion of the emoji sent are sad expressions.

Emoji date back to 1999 when they first appeared on Japanese cell phones. But it’s history goes further than that, because before there were emoji, there were emoticons. Emoticons were the pictorial ...

“That’s not at all surprising once you understand how these different smiley faces work,” the psychologist ... accurate depiction of the facial expressions we make. “Our brains ...