Akkam’s Razor

LinkedIn has grown to 9 million members—3.6 million of whom log in at least once a quarter—and attracted blue-chip advertisers like BMW, American Express (AXP), and Virgin Atlantic Airways by catering to an affluent demographic. The average LinkedIn user is 39 and makes $139,000 a year. Of the total, 89,000 are chief executive officers, and nearly half a million others occupy another job in the C-suite, LinkedIn says. In addition, companies including Microsoft (MSFT), eBay (EBAY), Target (TGT), and L'Oréal pay $2,000 to $10,000 a month for the ability to search LinkedIn's profiles for job candidates.