(Bloomberg) -- Facebook Inc. spent $5.1 million on lobbying in the third quarter, again boosting its Washington expenditures as internal documents leaked by a whistle-blower sparked fresh allegations of misleading Congress, the public and securities regulators. 

The social media company’s lobbying outlays represented a 6.7% increase from last quarter and a 3.9% increase compared to the third quarter of 2020. The amount outpaced other technology giants like Amazon.com Inc, Microsoft Corp. and Alphabet Inc.’s Google. 

Facebook is facing challenges in Washington on several fronts, including fresh scrutiny from lawmakers considering legislation to strengthen privacy rules for internet companies and protections for children online. The whistle-blower’s revelations allege that Facebook understood the risks its platforms posed to users and society at large, while downplaying those risks in public. 

Read More: Whistle-Blower Decries Facebook’s ‘Free Pass’ for Bad Behavior

The whistle-blower, Frances Haugen, a former Facebook product manager, filed complaints with the Securities and Exchange Commission, alleging that the company and its executives misled investors. 

Lawmakers are also working on bipartisan antitrust legislation that would have serious implications for Facebook’s business practices. And the Menlo Park, California, company is facing a challenge from the Federal Trade Commission over its previous acquisitions of the photo-sharing platform Instagram and the messaging service Whatsapp. 

Read More: Tech Giants Get New Chance to Weigh In on House Antitrust Bills

The third quarter lobbying disclosures, due Wednesday, show that Amazon spent $4.7 million, slightly less than the previous quarter. Google spent $2.6 million, up 24.9% from the second quarter. Microsoft also spent $2.6 million, a 6.5% increase from last quarter. 

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