Hi i think that you need to work now in something that you're very passionate about, that's when the really hard work comes..

I started too with ROR to develop applications in less amount of time, and believe javascript i think is a good tool to implement with ROR, it will help you a lot to develop the front-end...

But please don't try to make another social network, or photo sharing app, i think there are too much right now, i have no doubt that this could help you improve your coding skills...i got crazy when i hear that this xx company is developing a new cool sharing app...that's all!

good luck in your next project!