Google declined any comment.
"At what point is a platform like that a common carrier in the information age?", he asked, referring to the U.S. government's definition of a utility which, applied to Facebook, would enable the Federal Communications Commission to regulate the company.
United States tech stocks were dragged down Monday on fears that a USA justice department antitrust investigation into Google parent Alphabet could signal additional regulatory scrutiny for the sector.
European officials have already been aggressively pursuing antitrust cases against American tech firms, including Google, while so far the US has been mostly hands-off.
Google controls much of the technology used to buy online ads, and its Android operating system runs most of the world's smartphones.
Digital advertising revenue accounted for about 85% of revenue previous year for Google parent Alphabet.
Google has said it is transparent about how it promotes its own services, and that its focus has been on benefiting consumers.
As a effect and a first step, she added, "we have called on the Federal Trade Commission to break up Facebook and to reverse some of the acquisitions that were approved erroneously, Instagram and WhatsApp in particular".
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In 2013, the FTC closed an antitrust investigation of Google over whether it favored certain search results, among other things. It's the latest sign of growing interest in antitrust action against the largest technology companies-especially Google, Facebook, Amazon, and Apple.
The end of the probe, which some FTC insiders characterized as a wrist slap by the Obama administration, irked staffers eager to delve into the search giant's Android mobile operating system, two sources with direct knowledge of the situation said.
In a 2017 deal with the EU, Google agreed to pay $2.7 billion to resolve claims it unfairly steered business toward its shopping platform.
Some of the underlying developments appear to represent a divvying up the turf between the Department of Justice's antitrust cops and the Federal Trade Commission, which also holds antitrust authority. It is very rare to break up a company but not unheard of. The case settled with Microsoft intact.
If a judge does impose penalties on the tech giants, those punishments could include a small fine all the way up to requirements that the companies change their business practices, divest pieces of their businesses, and pay massive fines.
The FTC has already been investigating Facebook's sharing of data belonging to 87 million users with the now-defunct British political consulting firm Cambridge Analytica.
"The house is burning down here, and you guys are watering the rose bushes in the backyard", he said, voicing critics' concerns.
"There's still a long way to go before there is even an investigation", he said. President Donald Trump and many Republicans have complained that Facebook, Google and Twitter Inc. suppress conservative views. Representatives of the companies have denied the censorship claims. The splitting up of jurisdictions between the FTC and DOJ could be simply a response to the pressure, said Sandeep Vaheesan, legal director for Open Markets Institute, which advocates against monopolies.