Actually, they were under seal in ConnectU, Inc. v. Facebook, Inc., and Mark's attorneys fought very hard to keep them that way. They're only freely available now because they were leaked.
Given my personal stake in it all I'd like to know what the rest of the still-unpublished ones say.
I believe at least one of the "FRIEND"s is Adam D'Angelo, former Facebook CTO and now founder of Quora.
In any case, it's not as if Boing Boing hacked into Zuckerberg's computer to get these. They're freely available.