USCA11 Case: 21-12355 21-12355 Date Filed: 05/23/2022 Opinion of the Court Page: 3 of 67 3 ever-advancing technology, the basic principles of freedom of speech and the press, like the First Amendment’s command, do not vary when a new and different medium for communication appears.” Brown v. Ent. Merchs. Ass’n, 564 U.S. 786, 790 (2011) (quotation marks omitted). One of those “basic principles”—indeed, the most basic of the basic—is that “[t]he Free Speech Clause of the First Amendment constrains governmental actors and protects private actors.” Manhattan Cmty. Access Corp. v. Halleck, 139 S. Ct. 1921, 1926 (2019). Put simply, with minor exceptions, the government can’t tell a private person or entity what to say or how to say it. The question at the core of this appeal is whether the Facebooks and Twitters of the world—indisputably “private actors” with First Amendment rights—are engaged in constitutionally protected expressive activity when they moderate and curate the content that they disseminate on their platforms. The State of Florida insists that they aren’t, and it has enacted a first-of-its-kind law to combat what some of its proponents perceive to be a concerted effort by “the ‘big tech’ oligarchs in Silicon Valley” to “silenc[e]” “conservative” speech in favor of a “radical leftist” agenda. To that end, the new law would, among other things, prohibit certain social-media companies from “deplatforming” political candidates under any circumstances, prioritizing or deprioritizing any post or message “by or about” a candidate, and, more broadly, removing anything posted by a “journalistic enterprise” based on its content.