About once a month, on a Friday or Saturday night, the Silicon Valley Technorati gather for a drug-heavy, sex-heavy party. Sometimes the venue is an epic mansion in San Francisco’s Pacific Heights; sometimes it’s a lavish home in the foothills of Atherton or Hillsborough. On special occasions, the guests will travel north to someone’s château in Napa Valley or to a private beachfront property in Malibu or to a boat off the coast of Ibiza, and the bacchanal will last an entire weekend. The places change, but many of the players and the purpose remain the same.