The state and federal officials say Facebook's acquisitions of WhatsApp and Instagram violated competition laws and served to stifle rivals by giving the social network an unfair advantage.
The EU says Amazon exploits data collected from other sellers for its own benefit. These are the first formal charges against the retail giant in a spate of antitrust probes in Europe and the U.S.
An agreement worth up to $12 billion made Google the de facto choice for online search on millions of iPhones. Justice officials say the deal may be anticompetitive under U.S. law.
The antitrust lawsuit against Google is the most significant action the federal government has taken against a technology company in two decades. Google calls the lawsuit "deeply flawed."
House Democrats recommend Congress look at ways to force the companies to split off some of their businesses, saying the tech giants have exploited their power to benefit themselves and hurt rivals.
Senators pressed the tech giant on the scope and scale of its digital advertising business. Republicans repeated long-running allegations of conservative bias.
The CEOs tell Congress that the giant American tech companies do not stifle competition, saying the concern that too much power is concentrated in too few companies is unfounded.
The first congressional testimony by Jeff Bezos comes at a time when he and Amazon are seeming at their zenith, occupying ever-growing space in American culture.
