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The author of the post also had a Reddit AMA recently, related to Facebook's usage of D: http://www.reddit.com/r/IAmA/comments/1nl9at/i_am_a_member_o...

Among other things, he wrote the book "The D Programming Language".

I believe you're not very much into C++, I mean Andrei is a real celebrity here [as well] ;)

Also all this, this guy is one of top D contributors. He wrote a lot of D articles with Walter Bright (D's creator) and others.