I am working on a site and i need to post page links from that site to a special user wall or page if something is published on it which means i only need one user to post t
To post to someones wall (or perform any action with the open graph) you must be authenticated with facebook as somebody in their graph or an application that they have granted permission to.
You should look at the permissions that can be set using the oauth scope attribute...
https://developers.facebook.com/docs/reference/dialogs/oauth/
To me it looks like they will need to grant your application publish_stream if you want to write to their friends walls as well as the user that you are authenticated as.
https://developers.facebook.com/docs/reference/login/extended-permissions/