Here is one way to get your site post information posted on facebook wall.

• Add your application to Facebook: developers - button to "Set Up New Application", and fill out all required fields - just try to save it, then add those fields it wants you to add. Note that you can change that information later. Remember you application ID, key and Secret.

• Download php library from facebook: facebook-platform, upload it somewhere on your server.

• Generate  temporary (one time - if you waste it, you need to repeat this step again) token:

https://login.facebook.com/code_gen.php?api_key=YOUR_API_KEY&v=1.0

• Generate session key:

<?php

require_once '<path to facebook library, you uploaded>/facebook.php';

$FB_APIKEY="<Your Api Key>";
$FB_SECRET="<Your Api Secret>";

$fb = new FacebookRestClient($FB_APIKEY, $FB_SECRET);

$testtoken= "<Your Temporary Token>";

$result = $fb->call_method('facebook.auth.getSession',

array('auth_token' => $testtoken, 'generate_session_secret' => true));

echo "<br /><pre>";

print_r($result);

echo $session_key = $result['session_key'];

?>

• Give permission (for application) to publish on your wall

http://www.facebook.com/login.php?api_key=YOUR_API_KEY&connect_display=popup&v=1.0&next=http://www.facebook.com/connect/login_success.html&cancel_url=http://www.facebook.com/connect/login_failure.html&fbconnect=true&return_session=true&req_perms=read_stream,publish_stream,offline_access

• Publish message. You can get information on what more to add on facebook developers page about stream.publish

<?php

define('FB_APIKEY', '<Your Api Key>');
define('FB_SECRET', '<Secret>');
define('FB_SESSION', '<Session>');

require_once('facebook.php');

echo "post on wall";
echo "<br/>";

try {
 $facebook = new Facebook(FB_APIKEY, FB_SECRET);
 $facebook->api_client->session_key = FB_SESSION;
 $facebook->api_client->expires = 0;
 $message = '';

 $attachment = array(
 'name' => $_POST["name"],
 'href' => $_POST["href"],
 'description' => $_POST["description"],
 'media' => array(array('type' => 'image',
 'src' => $_POST["src"],
 'href' => $_POST["href"])));

 $action_links = array( array('text' => 'Visit Us', 'href' => '<link to some place here>'));

 $attachment = json_encode($attachment);
 $action_links = json_encode($action_links);

 $target_id = "<Target Id>";
 $session_key = FB_SESSION;

 if( $facebook->api_client->stream_publish($message, $attachment, $action_links, null, $target_id)) {
 echo "Added on FB Wall";
 }
} catch(Exception $e) {
 echo $e . "<br />";
 }
?>

In order to show page as the author of post you need to do two more things:

• Add your application to page: description on Facebook
• Execute following link (alter API key):

http://www.facebook.com/connect/prompt_permissions.php?api_key=YOURAPIKEY&v=1.0&next=http://www.facebook.com/connect/login_success.html?xxRESULTTOKENxx&display=popup&ext_perm=read_stream,publish_stream&enable_profile_selector=1

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