Is the webapp working for you? Also does it prompt you to login? Because I too have this problem. Seems more like a login issue more then anything. Any one have any ideas?
resolved it by logging in to the regular facebook site (use the link at the bottom of the iphone login page), and then [without logging out of the regular facebook], navigate iphone safari to iphone.facebook.com
resolved it by logging in to the regular facebook site (use the link at the bottom of the iphone login page), and then [without logging out of the regular facebook], navigate iphone safari to iphone.facebook.com