Zuckerberg willfully disregards meanings. It was very obvious in his speech during the testimony. If some members of congress could detect it, I heard no evidence. It is curious to me that sometimes the odd language format in facebook's help section are reminiscent of his disregard.

I am no psychologist but I've seen this behavior in two or three other occasions. One case was a teenager, who was just playing but also using it for obfuscation to his advantage in arguments. I had to explicitly call him on it. I had reason to believe it stemmed from insecurity and him having to daily deal with people who were not intellectually on par or of his type.