I know him personally and collaborated with him on some things while he was running Digiforce. It was always a stealth operation, but I know that the technology was real and that it was legitimately acquired. I know that doesn't amount to much reliability on a forum, but I use my real name for my username, so you can see I'm not making this up.

I only kept in limited contact with him after he went to Facebook, but from my experience with him in Raleigh, he's a stand up guy. I'm inclined to believe his story, because if he was incompetent he wouldn't have run FB's growth for several years before going to Snapchat.