20 MOODY v. NETCHOICE, LLC Opinion of the Court just described. Those principles have served the Nation well over many years, even as one communications method has given way to another. And they have much to say about the laws at issue here. These cases, to be sure, are at an early stage; the record is incomplete even as to the major social-media platforms’ main feeds, much less the other applications that must now be considered. See supra, at 12. But in reviewing the District Court’s preliminary injunction, the Fifth Circuit got its likelihood-of-success finding wrong. Texas is not likely to succeed in enforcing its law against the platforms’ application of their content-moderation policies to the feeds that were the focus of the proceedings below. And that is because of the core teaching elaborated in the above-summarized decisions: The government may not, in supposed pursuit of better expressive balance, alter a private speaker’s own editorial choices about the mix of speech it wants to convey. Most readers are likely familiar with Facebook’s News Feed or YouTube’s homepage; assuming so, feel free to skip this paragraph (and maybe a couple more). For the uninitiated, though, each of those feeds presents a user with a continually updating stream of other users’ posts. For Facebook’s News Feed, any user may upload a message, whether verbal or visual, with content running the gamut from “vacation pictures from friends” to “articles from local or national news outlets.” App. in No. 22–555, at 139a. And whenever a user signs on, Facebook delivers a personalized collection of those stories. Similarly for YouTube. Its users upload all manner of videos. And any person opening the website or mobile app receives an individualized list of video recommendations. The key to the scheme is prioritization of content, achieved through the use of algorithms. Of the billions of posts or videos (plus advertisements) that could wind up on a user’s customized feed or recommendations list, only the tiniest fraction do. The selection and ranking is most often

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