It ain’t champagne being opened. Sorry. Facebook user numbers in the UK went down last month. Probably no big deal. Neither is the fact that their chief revenue officer just quit, “amid scrutiny of Facebook’s $15 billion valuation, which many analysts say isn’t justified by the company’s revenue of about $150 million last year,” as the Wall Street Journal puts it. Scrutiny? Of valuations? Here? In the Valley? What the hell is the world coming to?