Like others among Facebook’s 400 million members, I’m awed and dazzled by the sheer power and growing grandeur of the site. But I’m also perplexed by the almost cavalier way in which it has approached the topic of privacy, as if privacy were a remnant of a bygone era. (Is this partly the byproduct of having a 26-year-old CEO — who grew up in an era where sharing trumps privacy — at the helm? I suspect so.)