There's been a lot of rumors swirling around about how Ahmadinejad actually came in third. No source has been given, at least not until now.
On iReport, there is a picture of a letter that was supposedly sent by the Interior Ministry to the President, saying both how the results were concocted and what the numbers really were. They match the ones from the rumor.
Of course, the letter could be fake. I don't really believe that Ahmadinejad came in third after Karroubi. But this is definitely more than just some twitter meme.
Edit: By the by, the man who supposedly leaked this died in an incredibly suspicious "car accident." Draw your own conclusions.