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Harvard Journal of Law & Technology Volume 35, Number 2 Spring 2022 CUSTOMIZED SPEECH AND THE FIRST AMENDMENT Daniel E. Rauch* ABSTRACT Customized Speech — speech targeted or tailored based on knowledge of one’s audience — is pervasive. It permeates our relation-ships, our culture, and, especially, our politics. Until recently, custom-ization drew relatively little attention. Cambridge Analytica changed that. Since 2016, a consensus has decried Speech Customization as causing political manipulation, disunity, and destabilization. On this ac-count, machine learning, social networks, and Big Data make political Customized Speech a threat we constitutionally can, and normatively should, curtail. That view is mistaken. In this Article, I offer the first systematic analysis of Customized Speech and the First Amendment. I reach two provocative results: Doctrinally, the First Amendment robustly protects Speech Customization. And normatively, even amidst Big Data, this protection can help soci...