Over time, emoji meanings have become subjective, depending on a message's context and wider cultural trends. Which shaking smiley face should you use ... Each category then breaks down emoji into ...

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.

Read at face value ... the upside-down smiley emoji to rolling one's eyes or shrugging in real life. Because tone of voice and facial expressions can drastically change the meaning of a phrase ...