The 20 participating publishers of Facebook's Instant Articles program just aren't getting as much money per post as they do for pieces posted on their own websites. As a result, the social network is now testing new advertising schemes, according to The Wall Street Journal. At the moment, each Instant Article can only have one 320 x 250 pixel-banner per 500 words of content, whereas a publication's website would usually have three to four. Plus, the initiative doesn't allow animated ads. The project's manager, Michael Reckhow, told the WSJ that since receiving feedback from the publishers, Facebook has been experimenting by adding more banners to random pages, even animated and interactive ones.