(Slip Opinion) OCTOBER TERM, 2022 1 Syllabus NOTE: Where it is feasible, a syllabus (headnote) will be released, as is being done in connection with this case, at the time the opinion is issued. The syllabus constitutes no part of the opinion of the Court but has been prepared by the Reporter of Decisions for the convenience of the reader. See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337. SUPREME COURT OF THE UNITED STATES Syllabus TWITTER, INC. v. TAAMNEH ET AL. CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT No. 21–1496. Argued February 22, 2023—Decided May 18, 2023 In 2017, Abdulkadir Masharipov carried out a terrorist attack on the Reina nightclub in Istanbul, Turkey, on behalf of the Islamic State of Iraq and Syria (ISIS), a designated Foreign Terrorist Organization. Masharipov killed Nawras Alassaf and 38 others. Alassaf’s family then brought this suit under 18 U. S. C. §2333, an Antiterrorism Act (ATA) provision that permits U. S. nationals who have been “injured . . . by reason of an act of international terrorism” to file a civil suit for damages. Instead of suing ISIS directly under §2333(a), the plaintiffs (respondents here) invoked §2333(d)(2) to sue three of the largest social-media companies in the world—Facebook, Twitter (petitioner here), and Google (which owns YouTube)—for aiding and abetting ISIS. The parties today agree on the basic aspects of these platforms: Billions of people from around the world have signed up for them and upload massive amounts of content each day. Defendants profit from that content by placing advertisements on or near it and use “recommendation” algorithms that match content, advertisements, and users based on information about the use, advertisement, and content being viewed. As the parties represent things, the algorithms here match any content with any user who is more likely to view that content, and the platforms perform little to no front-end screening on any content before it is uploaded. Plaintiffs, however, allege that for several years the companies have knowingly allowed ISIS and its supporters to use their platforms and “recommendation” algorithms as tools for recruiting, fundraising, and spreading propaganda; plaintiffs further allege that these companies have, in the process, profited from the advertisements placed on ISIS’ tweets, posts, and videos. The District Court dismissed the complaint

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