There are few technical details and of course he doesn't disclose his true identity. It's more about why? than how?
It's from a year ago, so apologies if this has been posted before, I searched and couldn't find anything.
Also a warning, as it's from reddit - Reading through the thread, it kind of goes off topic at times and takes many turns and tangents, so it can get a little confusing. Also, bad language...
http://www.reddit.co..._developer_ama/