The Federal Trade Commission Thursday dropped a two-year investigation into allegations that Google was gaming search results to drive traffic to its own sites. In a press conference, FTC Chairman Jon Leibowitz allowed that the charges came from a staggering number of Google’s competitors, and at face value they are plausible: Google essentially controls search with something like 70 percent of the market share and, like any company with near monopoly power, might be tempted to use that advantage to slyly divert traffic away from competitors. But in a unanimous vote all five FTC commissioners agreed there was nothing to see here.