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?

While you might assume that a heart emoji just means love, in emoji slang each different colour actually has its own hidden meaning. As Adam explains to his father: 'Red means love, purple horny ...

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.