Social media platforms are important actors in the development of alcohol marketing techniques. While public health research has documented the activities of brands and consumers related to alcohol promotion and consumption on social media, there remains the need to develop an account of the native, participatory and data-driven advertising model of these platforms. This article examines the relationship between alcohol brands, media platforms and their users by analysing the activity of the 20

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... most popular alcohol brands' Australian Facebook pages in 2012 and 2014. We report that the number of fans of alcohol brands increased 52% from 2012 to 2014. While the number of posts dropped 12% from 2012 and 2014, total interactions with posts by users increased by 9%. Overall, brand activity and engagement became more consistent between 2012 and 2014. We argue that the changing character of user engagement with alcohol brands on Facebook can be related to changes in the platform architecture. Facebook is orchestrating a shift from exposure to engagement as its key advertising metric, and thus departing substantially from established mass media advertising paradigms. Effective policy responses to alcohol marketing in the digital era depend on a more rigorous examination of the marketing infrastructure of social media platforms.