Open Graph permissions let the app publish "actions" on user's own timeline.
If the app wants to post on friends' timeline does it need to post a good old "wall post" (publish_stream permission) ?
Thanks
As you can clearly see from https://developers.facebook.com/docs/authentication/permissions/#open_graph_perms there is no friends permission equivalent to 'publish_actions'.
And it makes no sense at all to publish an action on behalf of a friend, because actions are ment to be undertaken by users themselves; take the object/action combo „book” and „read”, for example – what sense should it make for me to post on your wall that you are supposedly reading Harry Potter and the whatever …?
来源：https://stackoverflow.com/questions/10661667/can-i-post-on-a-friends-wall-as-open-graph-action-or-i-need-a-classic-wall-p