The blue heart emoji first came out in 2010 and was added to Emoji 1.0 in 2015. If you're unsure about how to use a heart emoji, we have this handy guide . When should you use the blue heart emoji?

Either way, it's believed that the heart symbol as we know it today was used by Saint Valentine, a third century Roman saint who is remembered with a celebration on February 14th.

The 13th-century French manuscript "Romance of the Pear" contains an early depiction of the heart as a symbol of love. Allegorical image from the Roman de la poire. Image courtesy of Bibliothèque ...

Valentine’s Day is once again upon us. In 2006, Keelin McDonell attempted to track down the origin of the holiday’s heart-symbol to explain how it got its familiar shape. Her article is ...

Once the sole preserve of tacky tourist T-shirts, the heart symbol – as in I ‘heart’ New York – has become the first graphical entry in the Oxford English Dictionary in its 127-year history.