It doesn't make it clear in "Search Threads and Posts", that if you specify a prefix, you can only search the threads. I can think of many times that you'd want to search for posts within a thread with a specific prefix. Should you be able to? http://xenforo.com/community/threads/twitter-error-on-external-accounts-page.70346/ prefix of XF 1.3 and search for the word "Authentication". The page above does not appear.