Rails - Feb 2011 - How to send parameter from facebook app and return the same

I want to send user id as a parameter in my facebook app and want to
return the same to keep track of the user who''s connected to facebook
from my app. I''m using Oauth2 methods - authorize_url and
get_access_token. I tried to add parameter here but didn''t work. If
anyone has any idea, please share...

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