Possible Duplicate:
Changing graph feed to public and private
Why is it that the graph api now requires an access token for a public feed?
i.e. You can see a feed publicly on that page without even being logged into facebook, yet you can’t parse it using the API.
Does this mean that it’s now impossible to get the json of a public feed on a page you do not own / have admin access to in order to get an access token?
This is required since June 2011 to make it standard so that all API requests require access token and there are no more anonymous access to the API. It is still possible to access the RSS feed of the public pages.
https://www.facebook.com/feeds/page.php?id=PAGE_ID&format=rss20
hope this helps