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.

Over time, emoji meanings have become subjective, depending on a message's context and wider cultural trends. Which shaking smiley face should you use? Is there a difference between each ...

By chaining the selectors together, he was able to encode invisible messages inside an emoji (or any other Unicode character). Here is how it works: Unicode assigns variation selectors (U+FE00–U ...