fined Facebook $5 billion in 2019 for privacy violations, there were few significant changes to how the company’s products operate. And Facebook continues to grow: More than 3.45 billion people use one or more of its apps — including WhatsApp, Instagram or Messenger — every month.

The decisions were particularly deflating after actions to rein in tech power in Washington had gathered steam. Ms. Khan’s appointment to the F.T.C. this month followed that of Tim Wu, another lawyer who has been critical of the industry, to the National Economic Council. Bruce Reed, the president’s deputy chief of staff, has called for new privacy regulation.

Mr. Biden has yet to name anyone to permanently lead the Justice Department’s antitrust division, which last year filed a lawsuit arguing Google had illegally protected its monopoly over online search.

The White House is also expected to issue an executive order this week targeting corporate consolidation in tech and other areas of the economy. A spokesman for the White House did not respond to requests for comment about the executive order or Judge Boasberg’s rulings.

Activists and lawmakers said this week that Congress should not wait to give regulators more tools, money and legal red lines to use against the tech giants. Mr. Cicilline, along with Representative Jerrold Nadler of New York, the chairman of the House Judiciary Committee, said in a statement that the judge’s decisions on Facebook show “the dire need to modernize our antitrust laws to address anticompetitive mergers and abusive conduct in the digital economy.”

Senator Amy Klobuchar, a Democrat of Minnesota who chairs the Senate Judiciary Committee’s subcommittee on antitrust, echoed their call.

“After decades of binding Supreme Court decisions that have weakened our antitrust policies, we cannot rely on our courts to keep our markets competitive, open and fair,” she said in a statement. “We urgently need to rejuvenate our antitrust laws to meet the challenges of the modern digital economy.”

But the six bills to update monopoly laws have a long way to go. They still need to pass the full House, where they will likely face criticism from moderate Democrats and libertarian Republicans. In the Senate, Republican support is necessary for them to overcome the legislative filibuster.

The bills may also not go as far in altering antitrust laws as some hope. The House Judiciary Committee amended one last week to reinforce the standard around consumer welfare.

Even so, Monday’s rulings have given the proposals a boost. Bill Baer, who led the Justice Department antitrust division during the Obama administration, said it “gives tremendous impetus to those in Congress who believe that the courts are too conservative in addressing monopoly power.”

Facebook and the tech platforms might like the judge’s decisions, he said, “but they might not like what happens in the Congress.”

Mike Isaac contributed reporting.

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