How to save a Facebook app worth saving?

BlacHoel writes: "Luingo is a Facebook application for learning languages, mostly vocabulary. The application tests the user's vocabulary in the selected study language using audio recorded by native speakers (Or at least people who claim they are) to prepare them for the daily tests, and the tests themselves are multiple choice based, with the audio of each word/choice played back to hopefully make the user remember the correct answer. Right now anyway, the application is free. I'd like to get to the point though: The application is dyeing, and I think it's a shame to see so much work and code go to nothing like that. The application has some real graphic design issues and has the appeal of the average accountant's conference compared to a good deal of popular Facebook applications, but unlike those applications (Just think of those insanely popular apps like "Fancheck", an app that gained 5 million users in a single day) it has use and could even be a good alternative to relatively pricey solutions like Rosetta Stone, since the audio for the tests- And even the tests themselves- are crowdsourced, which reduces costs for the developers. Just new users isn't nearly enough to save it- with a few good ideas I think this app could really take off and help all kinds of serious or hobbyist language learners. What would you do to save it?"