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But how do mobile developers learn what constitutes privacy? We analyze discussions about privacy on two major developer forums: one for iOS and one for Android. We find that the different platforms produce markedly different definitions of privacy. For iOS developers, Apple is a gatekeeper, controlling market access. The meaning of \u201cprivacy\u201d shifts as developers try to interpret Apple\u2019s policy guidance. For Android developers, Google is one data-collecting adversary among many. Privacy becomes a set of defensive features through which developers respond to a data-driven economy\u2019s unequal distribution of power. By focusing on the development cultures arising from each platform, we highlight the power differentials inherent in \u201cprivacy by design\u201d approaches, illustrating the role of platforms not only as intermediaries for privacy-sensitive content but also as regulators who help define what privacy is and how it works.<\/jats:p>","DOI":"10.1177\/1461444817702397","type":"journal-article","created":{"date-parts":[[2017,4,27]],"date-time":"2017-04-27T07:00:36Z","timestamp":1493276436000},"page":"1640-1657","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":54,"title":["Platform privacies: Governance, collaboration, and the different meanings of \u201cprivacy\u201d in iOS and Android development"],"prefix":"10.1177","volume":"20","author":[{"given":"Daniel","family":"Greene","sequence":"first","affiliation":[{"name":"Microsoft Corporation, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katie","family":"Shilton","sequence":"additional","affiliation":[{"name":"University of Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2017,4,27]]},"reference":[{"key":"bibr1-1461444817702397","doi-asserted-by":"publisher","DOI":"10.1109\/MSP.2014.70"},{"key":"bibr2-1461444817702397","first-page":"176","volume-title":"Proceedings of the first annual HASTAC conference","author":"Bogost I","year":"2008"},{"key":"bibr3-1461444817702397","doi-asserted-by":"publisher","DOI":"10.1145\/1592606.1592616"},{"key":"bibr4-1461444817702397","first-page":"1904","volume":"126","author":"Cohen JE","year":"2012","journal-title":"Harvard Law Review"},{"key":"bibr5-1461444817702397","unstructured":"comScore (2015) The 2015 US mobile app report. 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