Once upon a time, (NASDAQ: GOOGL) (NASDAQ: GOOG) seemed invulnerable. The company maintained an insurmountable position in search and parlayed its supremacy into a pole position in the digital search market -- and no rival even came close.

Over the past several years, however, even while its search continued to dominate, it appeared Google's share of the digital advertising market had been slipping -- slowly and gradually -- but falling nonetheless. In testimony during the company's federal antitrust trial, Google executives begrudgingly admitted what many have suggested for some time: Some of the company's newest rivals are stealing market share.

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Source Fool.com