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.

It stands to reason that, like a Valentine's Day heart, a red heart emoji means love. But what does a white heart emoji mean?

If you can't find an emoji that accurately expresses your feelings, combine two face emojis to create a new emotion. You can ...