Twitter will now run American Express pre-roll ads before Fox programming is displayed on the social network. As part of the Amplify program that launched last week, these Fox spots are ads themselves by design, so the American Express pre-roll ads are effectively ads on top of ads. It’s part of Twitter’s continued effort to become profitable as soon as possible in light of its IPO. Right now, that’s scheduled to be 2015, but if the company can leverage ads to make that happen sooner, they’ll take every chance they can get.