If you've been unenthused about the emoji of recent years ... expressive faces, like the face with tears of joy, the thinking face, the angry devil, the smiling pile of poo, and the see-no ...

eggplant and smiley devil face are best avoided. The editor-in-chief of Emojipedia, the emoji search engine, says emojis can be used to 'inject a sense of playfulness' with flirtatious banter.

Spotting it is straightforward enough. But can you do it in ten seconds? A sad face devil emoji is hidden among a load of smiling devil emoji. So far, almost 170,000 people have liked the video.