If you don't update iOS, alien emoji will invade your Twitter
Remember John Carpenter’s They Live, a movie where aliens hid among the population as humans and could only be seen through special sunglasses? Think of pre-updated iOS as your pair of sunglasses:
Or to put it another way, the new diverse emojis don’t work on a diverse array of devices yet. The new multicultural emojis, which are a subset of one another, have yet to be adopted by all platforms. Take Android, for instance, which treats all the different variations as the same (albeit interpreted differently based on the emoji art in each device):
LG Flex 2 (left) and Nexus 6 (right)
Twitter’s website doesn’t fare much better, but that’s more because Twitter uses its own emoji art, which hasn’t been updated…
Source:: The Verge