Emojis were initially dismissed by many as childish, casual and confusing. However, their reputation is on the up and up, with various studies about their use and fit within linguistics and then the Oxford Dictionary going so far as to declare the 'Tears of Joy' as it's Word of the Year. 

Controversial perhaps, but it is the world's favourite emoji. Popping up over 6.6 BILLION times on Twitter this year, the universality of the little face has to be acknowledged. It transcends language barriers and is very expressive - leading to Wired suggesting perhaps Time should have named Tears of Joy Emoji their 'Person of the Year'.