Posting to a friends wall on facebook privately using graph api

Question

I wanted to post a feed to a friends wall from my app and set it as private, which is viewable to the logged in user and the friend. I want to do this using the new Graph ap

Answer 1

From now on it's not possible to post on user's friend wall due to February 6, 2013 breaking changes:

https://developers.facebook.com/roadmap/completed-changes/

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.