You unique ability to translate the idea into a product that people love, and deliver a service that wow's them, is far more valuable than the idea itself.
Of course there are caveats for things that are truly hard innovations, but from the sounds of things here you're more worried about UI (will always be easily copyable, no protection possible) and back-end (which doesn't matter unless it's some completely novel and order-of-magnitude improvement thing, in which case THAT's the true interesting part of your idea).