Gov. Gavin Newsom has called for a ban on social media for young teens — citing his own daughter and her phone-obsessed friends as examples of why a clampdown is needed. “I had a birthday party just a few weeks ago, with a lot of my daughter’s friends, and I literally stopped everybody because there were seven of them together — all of them on their cell phone at the birthday party, not one of them talking to each other,” Newsom said Thursday. “We have a generation that’s never been more