Paul Graham Network (n): One or more overlapping groups of people on earth. They’re the Skull & Bones of Silicon Valley, the Freemasons of Geekdom, the apex predators of innovation. They are the most accomplished engineers/entrepreneurs on earth: high energy, deeply social and deeply technical. They do the extraordinary.
Their junior members cut their teeth founding startups and the silverbacks stock the VC funds and angel lists, forever on the hunt for their own kind.
Also see here.