Lauren Feiner writes: “Social media companies have long made their own rules about the content they allow on their sites. But a pair of cases argued before the Supreme Court February 26 will test the limits of that freedom, examining whether they can be legally required to host users’ speech. The cases deal with the constitutionality of laws created in Florida and Texas. Both essentially limit the ability of large online platforms to curate or ban content on their sites, seeking to fight what lawmakers claim are rules that suppress conservative speech.”