"The FTC's fictional market ignores the competitive reality: Facebook competes vigorously with TikTok, iMessage, Twitter, Snapchat, LinkedIn, YouTube, and countless others to help people share, connect, communicate or simply be entertained," Facebook said in a statement. "The FTC cannot credibly claim Facebook has monopoly power because no such power exists."
[...]
U.S. District Judge James Boasberg had ruled in June that the FTC's original lawsuit was "legally insufficient" and didn't provide enough evidence to prove Facebook was a monopoly. He dismissed the states' separate complaint outright.

archived Essays in competition policy, "Identifying antitrust markets"