I guess this point is not settled, but emojis as an English plural looks uncomfortable and wrong to me.
Emoji is plural. Singular is emojum.
Also, I don't think that "You too" needs a response.
I like how 7, 8, and 9 tell a little story.
The OP is more or less spot on. That's mostly what I use them for, the rest being ironical. But the singular of emoji, pace Moby, is emojus.
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