Outgoing Goldman Sachs Chief Executive Lloyd Blankfein was spotted on Tuesday hobnobbing with fellow billionaire Oprah Winfrey in Portofino, Italy, amid a gathering of industry titans. The two moguls were seen strolling through the famous cobblestoned streets of the Mediterranean city with Hollywood titan David Geffen, Tom Hanks, IAC/InterActiveCorp CEO Barry Diller and others. The...