That escalated quickly. As Facebook’s stock continues to plummet, now half of where it started, the New York Times bluntly laid the blame for it on the company’s CFO, David Ebersman. Now everyone seems to have an opinion about the man who has seen much less of the spotlight. Andrew Ross Sorkin, the writer of the original article, said: Mr. Ebersman’s name, however, is mentioned only occasionally, usually in passing and typically only among Silicon Valley’s cognoscenti. And yet if there is one single individual more responsible than any other for the staggering mispricing of Facebook’s…