Facebook is the most anti-competitive of them all IMO. "Monopolist" and "anti-competitive" are overlapping yet distinct legal concepts in antitrust law. Facebook had a well known "buy or bury" strategy where they would either buy their competitors or try to destroy them. What is interesting is that IMO FB has had antitrust pressure before google/apple/amazon and this basically froze FB's M&A teams for the past ~4 years. In this time we have seen 4 new promising independent social media networks arise (tiktok, dispo, clubhouse, substack). IMO without the antitrust pressure against FB the current state of social media would be more consolidated, less likely that these 4 new networks would be independent/growing quickly at this stage.