In case you don't know, but I love emoji's & emoji's love me!!
I don't know about the history of emoji's or how they were introduced, however what I do know is that emoji's brought to iOS phones & they were later then brought onto WhatsApp. Also a little known fact about these cute little emoticons is that there are exactly 845 emoji's & 1,620 emoji's are supported by iOS.
If you reading this then i hope you learned a bit about the little diagrams you use.