U.S. antitrust regulators started a formal investigation into whether Google abuses its market power by favoring its own services over those of rivals in online searches and through other practices. The company has been accused of anticompetitive practices by other companies doing business online. “It’s still unclear exactly what the FTC’s concerns are, but we’re clear about where we stand,” Google said on its official blog. “Since the beginning, we have been guided by the idea that if we focus on the user all else will follow.”