We have a desktop/laptop version, which also shows on tablets. We have a mobile version, for mobile devices. We have an iOS app, that we're currently tweaking, making it better and better. We're also in the process of creating an Android app. We'll keep everyone updated on when they're all available!
There is a very good mobile version. Instead of making an app i suggest girls ask guys to make it compatible with Google chrome's add to homescreen fullscreen featue that iPhones also have. That way you get the native app feel.
I noticed the site didn't load as the mobile version on some browsers on my phone as well. If we are talking about an android phone here i recommand downloading Google Chrome from the store as it works great on this website.