The brand will run such ads before videos from Fox shows including Glee, Brooklyn Nine-Nine and So You Think You Can Dance, among other shows, Jean Rossi, EVP of sales for Fox Broadcasting, told Variety. The first such ads launched last week.
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Twitter began running Fox clips as part of Amplify, a program that brought sponsored clips to users' news feeds in May. As Gawker points out, that means that the AmEx ads are, in effect, ads on top of ads.
Though Twitter's IPO was considered successful, the company is not expected to post a profit until 2015 at the earliest. Since the company's main source of revenues comes from advertising, Twitter has to walk a fine line between pleasing advertisers without compromising the user experience.