updated faq

git-svn-id: https://plugins.svn.wordpress.org/facebook-publish/trunk@1054124 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated FAQ 

git-svn-id: https://plugins.svn.wordpress.org/facebook-publish/trunk@1054125 b8457f37-d9ea-0310-8a92-e5e31aec5664