“…We postulate that on social media the context (i.e., the platform), not the content, of advertising is a key determinant of its effectiveness. Although media context research shows that engagement with magazines, TV programs, and websites can carry over to evaluations of advertising included in the medium (Malthouse, Calder, and Tamhane 2007;Calder, Malthouse, and Schaedel 2009;Calder, Isaac, and Malthouse 2016), to the authors' knowledge, this has never been tested with social media. Moreover, we argue that it is unlikely or inappropriate to equate engagement with a medium with advertising effectiveness because it disregards engagement with the embedded advertising.…”