I have an iOS app that needs to publish to a users facebook wall. Up until today (February 1st) everything was working ok. Now when a user goes to authorize the app, it only asks for basic permissions and not for the ability to publish to the users wall. I am sending a publish_stream parameter but it seems like it is getting "lost" somewhere. Any ideas?
You have to use the Single Sign On (SSO) and the Graph API to Publish in the user's wall.
It's a change in Facebook security policy and now using the publish_stream won't work anymore.
I suggest you to follow the steps of the new tutorial: https://developers.facebook.com/docs/mobile/ios/build/
This previous answer to StackOverflow explains the problem of the deprecation of publish_stream