I'm pretty sure it's real. I went to high school and college with Jeff Hu. He shared the links to this on Facebook. Definitely happened. There's the whole reddit thread too: http://www.reddit.com/r/photography/comments/1ajifl/someone_...

I'm not sure he or anyone else had anything to gain out of lying about this. I had a Canon T2i for quite sometime and it definitely does embed the camera's serial into each captured image.