A Washington federal judge on Monday handed Facebook a major victory in its battle against government regulators, dismissing two antitrust lawsuits against the social media giant and questioning assertions that Facebook is a monopoly.

In dismissing one of the lawsuits, U.S. District Judge James E. Boasberg said the Federal Trade Commission had failed to offer enough facts in its complaint to prove its assertion that Facebook controlled 60 percent of the social media market. He gave the agency 30 days to file an amended complaint with more details to bolster its case.