More than a week after Google+'s launch, millions of social networkers are still crying out in vain for their invitations. Naturally, though, the tech industry's cultural elite are already inside the door, checking things out and getting an advance look-see. OK, not all of Google+'s first settlers are titans of technology; they're mostly just people who happened to be on the ball enough to ask for an invite before Google halted the sign-up process. But among them is none other than Mark Zuckerberg, founder of Google+'s assumed arch rival, Facebook.