With each passing day, there are greater fears about these companies controlling our online lives.

WASHINGTON, United States (AFP) — A coalition of US states unveiled on Friday an antitrust investigation of Facebook, the first of what is expected to be a wave of action against dominant technology firms.

New York state Attorney General Letitia James announced the action on behalf of seven other states and the District of Columbia to probe “whether Facebook has stifled competition and put users at risk.”

The case may be the first in a series of antitrust actions against Big Tech firms and highlights growing “techlash,” based on worries about platforms which control the flow of online information and dominate key economic sectors.

“We will use every investigative tool at our disposal to determine whether Facebook’s actions may have endangered consumer data, reduced the quality of consumers’ choices, or increased the price of advertising,” James said.

Joining the action were attorneys general of Colorado, Florida, Iowa, Nebraska, North Carolina, Ohio, and Tennessee, James said.

Earlier this year the US Department of Justice said it would launch a “review” of major online platforms to determine if they have stifled innovation or reduced competition.

It was not immediately clear if the states would be working in coordination with federal officials.

Facebook offered no immediate comment, but in the past it has claimed it is not a monopoly and that consumers have many choices for how to connect with people online.

The new probe “shows how unease with large tech companies is spreading beyond Congress and the federal government agencies to the states,” said Michael Carrier, professor of antitrust law at Rutgers University.

“With each passing day, there are greater fears about these companies controlling our online lives.”

Yet the legal basis for an antitrust action remains unclear, said Eric Goldman, director of the High Tech Law Institute at Santa Clara University.

“It remains to be seen if the (attorneys general) have any merit to their complaints or if they will be conducting a fishing expedition hoping to find some damning evidence,” Goldman said.

“Companies as large as Google or Facebook probably have minor problematic practices the AGs could target, but I’m still waiting for any evidence that would support more structural challenges to the Internet giants’ practices.”

A separate coalition of states was set to launch another antitrust initiative, with Google reportedly a target.

The office of the Texas attorney general scheduled an event Monday in Washington with a “broad coalition of states” to unveil a probe into “whether large tech companies have engaged in anticompetitive behavior that stifled competition, restricted access, and harmed consumers.”

Google confirmed Friday that the Department of Justice had asked for its records on previous antitrust probes.