When posting to my friends wall, I got this error:
Feed story publishing to other users is disabled for this application.
Do I need to submit my application in Facebook, or did I do something wrong?
This functionality is in the process of being removed.
Removing ability to post to friends walls via Graph API
We will remove the ability to post to a user’s friends’ walls via the Graph
API. Specifically, posts against [user_id]/feed where [user_id] is
different from the session user, or stream.publish calls where the
target_id user is different from the session user, will fail. If you
want to allow people to post to their friends’ timelines, invoke the
feed dialog. Stories that include friends via user mentions tagging or
action tagging will show up on the friend’s timeline (assuming the
friend approves the tag). For more info, see this blog post.