Or maybe I just started paying attention to emojis more :-)
I wonder whether the Russian "это [просто] огонь" has evolved independently or whether one has influenced the other (or both were influenced by something else).
I remember the Russian жечь ("аффтар жжот") from the early Internet and probably FIDO days. Perhaps it has evolved from Pushkin’s глаголом жги passed through the numerous generations of bored teenagers... I wonder whether the Russian story about это огонь is related.