recommendations for Spotify

My web app is finally up and running http://recommendationsforspotify.com . I have ran some Facebook promotions but cant seem to get any users. This project has only been up for a week and Im seeking feedback as this is my first real web application. Im excited to share it with you and hope I can get some honest feedback about the project! If you have a Spotify account please check it out and let me know what you think.