Facebook API: I can't post a message to friend's wall or an other's wall

Question

I don't know why i can use $post=$facebook->api('/me/feed','post','message'); to post a message on my wall (just message, no link, no video, no photo), but when i replace 'me' by my friend_id or other_id, i can't post a message, although my app had permission to need to post a message on feed.

Answer 1

Posting on wall of the user′s friends is a deprecated functionality and will not be available anymore very soon, because in 99% of the cases it′s unwanted and spam.

See Roadmap:

https://developers.facebook.com/roadmap/

Removing ability to post to friends walls via Graph API

So, if you create a new app, the "February 2013 Breaking Changes" will already be activated and it′s not possible anymore. This is mostly for spam reasons, no serious app posts on a friends wall.