In addition to the other suggestions, send a note to Facebook that you purchased their "FaceBook for iPad" app (include a link to the app store page) and are extremely disappointed with the functionality. After Facebook legal complains to Apple about the app perhaps the submitter will be banned and all their apps removed or at least their apps will be under much stricter scrutiny. And a request of your own to remove the "Pro" app may be better received. Also, contact the other devs who had their apps ripped off and urge them to complain about this submitter as well.