Feeling a bit 
as I probably should know.
At the end of text messages or on some threads on GN
There is often a little black filled in box instead of an emoji.
I'm not on facebook but think this is where they may have started. I use a blackberry phone for GN (as prefer to press keys on qwerty keyboard) which doesn't have these symbols
I know where I am with 
or a 
.
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