Tom Jones, or some other guy?

I looked at a post in the "Post your Age and Gender topic" and a post was replaced by a guy named Tom Jones. o_o The message was exactly the same, but it was Tom Jones instead. Can anyone explain to me what hath happened?

The user I am speaking of used to have an avatar of themselves wearing sunglasses and one heck of a good hair-style. o.o

Edit: Forgot his posts.

"18 year old male soon to join the army."

Reply to his post: "Is that you in your avatar?"

Tom jones?: "Yes. Don't I LOOK 18?"

The real Tom Jones is Kawaii Mistubishi

It's not the the post was replaced, it was just the the user got a temporary name change because some of the staff went crazy and...changed some people's names. I think they're all back to normal, though.