I’m making a facebook app and have got as far as getting the user to allow my apps permissions, which then generates a code. Then using this code to get an access token. So I now have a variable in my PHP script containing the access token. Now how do I use this to post to the users wall?
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The easiest way to post a message on the wall is through the graph api. You require the publish_stream permission to post status messages. You can simply do a POST with the desired message and the access token.
See the official facebook documentation for more details: http://developers.facebook.com/docs/reference/api/status/