One measure of the rapidity of change in mobile was last week's closure of the Federal Trade Commission's antitrust investigation of Google. The commission agreed with Google's defense that the sheer speed of change in the online universe, particularly with the advent of mobile devices, is outpacing any company's ability to achieve and maintain dominance. Even in Google's case, its apparent mobile search dominance is already being challenged by applications that offer better results in particular fields or better presentation on tablets.

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