How big is too big? Amazon sparks antitrust concerns

Amazon.com, America's fifth-largest company by market value, is still growing like an adolescent and planting flags in new markets. That is prompting some policymakers and legal experts to ask: How big is too big?

FTC clears Google purchase of mobile ad service (Update)

(AP) -- Federal regulators have approved Google Inc.'s $750 million acquisition of the mobile ad service AdMob despite worries that the deal will enable Google to extend its dominance of Internet marketing into the nascent ...

Microsoft-Yahoo deal to face tough antitrust probe

(AP) -- The Internet search partnership between Microsoft and Yahoo faces a tough antitrust review in the U.S. and overseas, with approval likely hinging on whether the marriage would foster more competition with market ...