That's very interesting, but isn't very convincing. Is there some kind of study on the supposed differences? I like BSD, but I've always felt from admin experience that the Linux networking stack is far more capable in terms of features.
Well obviously it is a brief statement. Linux generally does have enormous numbers of features, but they are no use if they do not apply to you. My guesses about Facebook is that network stack issues would be around ipv6, performance or large scale (eg lost of routes).
BSD is the implementation to the networking stack.
From the API design / pedigree side, sure. But that's a given, and a tangent to the curiosity I am trying to have sated :)