Twitter and Facebook app authorization process

Hi there,

I recently added Facebook integration to my app NowPlaying (was released with Twitter only). So now the users can share the music they are listening to on Twitter as well as facebook. But, before they start sharing things on their Twitter and/or Facebook accounts via the app, they need to authorize the app to access their accounts. Both the networks use different process in authorization and i'll be explaining the process below. I'll be using the app NowPlaying, but process will be similar for any other apps.