Google Inc. has stopped inviting users to join Google+, the company’s new social network, just 48 hours after beginning an exclusive roll-out of the service.”Insane demand,” explained a Google rep. “We need to do this carefully, and in a controlled way.” So when will they maybe let you in the club again? “As part of the Field Trial, we may open and close Google+ to new users at any time,” the rep explained. (Subtext: We won’t even tell you our hours. If you’re in the know, you’ll just know when we’re open.) “We’re thrilled so many people are interested in trying out a new approach to online sharing.” Oh, aren’t you just so smug, Google rep. [Reuters]