This image has been floating around the internet for quite a while. Over four years, I would guess, which is a lifetime in internet years.
I don't know why it caught my attention, but it did, and I decided to see if I could find any information about it. Or rather, although it's obvious the picture has been photoshopped, I was curious how much it had been altered.
I soon dug up a second (seemingly earlier) version of the picture. Exhibit B:
The girl's tongue is shorter here, but it's still very long. So is this the original photo? Or has it also been shopped? I don't know, but my suspicion is that it's the original. Which means the girl in the picture really does have a very long tongue. Who this girl is, I have no idea. But I wonder if she's aware that she's famous on the internet as 'long-tongue girl'?