For those of you who cynically believed selfies were just a passing fad and would never take off, prepare to eat your words.
Selfies are in fact constantly evolving, though whether for better or worse is up for debate.
There was the duck face craze which was apparently usurped by the fish gape. Then, of course, there are no make-up selfies plus something called the T-Rex hand 
which all the cool kids do
https://youtu.be/7SmV6HCZDcQ