Need Suggestion "Is it possible"

Hi,

  I am newbie to rails , I need some clarification of ("Without Access Token" )access facebook users information like username,wall, subscription,picture etc.
 I have apps in rails 3,

it has list of artist users he upload songs, videos within my application, when the public (No Need to Login) can hear the list of songs,videos. i decide to fetch the facebook/twitter basic information of current song artist and shown to the public in the popups.

Is it possible to do this.

Sorry for the English.

Thanks,

Sathish M