Exemplo de post na timeline do Facebook no CakePHP

UsersController.php

<?php
App::uses('AppController', 'Controller');
App::import('Vendor', 'Facebook', array('file' => 'facebook-php-sdk/src/facebook.php'));
App::import('Network/Http', 'HttpSocket');

/**
 * Users Controller
 *
 * @property User $User
 */
class UsersController extends AppController
{

    public $uses = array('User', 'UsersSkill', 'Group', 'Materia', 'MateriasUser', 'Node');
    public $components = array('SendEmail');
    
    
    public function facebookLogin()
    {
        $this->view = 'login';
        
        $facebook = new Facebook(array(
                'appId' => Configure::read('facebookAPI.appId'),
                'secret' => Configure::read('facebookAPI.secret')
            ));
        
        $user = $facebook->getUser();
        
        
        // We may or may not have this data based on whether the user is logged in.
        //
        // If we have a $user id here, it means we know the user is logged into
        // Facebook, but we don't know if the access token is valid. An access
        // token is invalid if the user logged out of Facebook.
        
        if ($user) {
          try {
            // Proceed knowing you have a logged in user who's authenticated.
            $userProfile = $facebook->api('/me');
            
            $this->Session->write('facebookLogin', true);
            
            if ( $databaseUser = $this->User->findByFacebookId($user) ) {
                if ($this->Auth->login( $databaseUser['User'] )) {
                    
                    $reactivation = '';
                    if ( $this->Auth->user('status') == 'inactive' ) {
                        $reactivation = 'Seu cadastro estava inativo até o momento. Ao realizar este login ativamos o mesmo novamente.';
                    }
                    
                    $this->Session->setFlash('Login realizado com sucesso! ' . $reactivation, 'default', array('class' => 'alert alert-success'));
                    $this->redirect('/minha-conta');
                }
            } else {
                
                $userData = $userProfile;
                if ( $imagem = $facebook->api('/'.$user.'?fields=name,picture') ) {
                    $userData['photo'] = $imagem['picture']['data']['url'];
                }
                
                if ( $this->facebookRegister( $userData ) ) {
                    // Postando na linha do tempo
                    $message = '
                        Estou fazendo parte do Me Ajuda Professor, venha você também - http://meajudaprofessor.com.br  ;)
                    ';

                    $HttpSocket = new HttpSocket();
                    $results = $HttpSocket->post('https://graph.facebook.com/' . $user . '/feed', array('access_token' => $facebook->getAccessToken(),
                        'message' => $message));
                    
                    $this->redirect('/meu-perfil');
                }
                
            }
                
            } catch (FacebookApiException $e) {
            error_log($e);
            $user = null;
          }
        }
        
        // Login or logout url will be needed depending on current user state.
        if ($user) {
          $logoutUrl = $facebook->getLogoutUrl();
        } else {
          $statusUrl = $facebook->getLoginStatusUrl();
          $loginUrl = $facebook->getLoginUrl(array('scope' => array('publish_stream', 'user_friends')));
          
          $this->redirect($loginUrl);
        }
    }
    
    
    /**
     * 
     * @param array $facebookUser
     * @throws NotFoundException
     */
    public function facebookRegister( $facebookUser = array() ) 
    {  
        if ( empty($facebookUser) ) {
            throw new NotFoundException('Sua sessão do Facebook expirou');
        }
        
        $address = array(0 => 'ND', 1 => 'ND');
        if ( isset($facebookUser['location']) && !empty($facebookUser['location']['name']) ) {
            $address = explode(', ', $facebookUser['location']['name']);
        }
        
        $user = array('User' => array(
                'facebook_id' => $facebookUser['id'],
                'facebook_login' => $facebookUser['username'],
                'name' => $facebookUser['first_name'],
                'surname' => $facebookUser['last_name'],
                'email' => isset($facebookUser['email']) ? $facebookUser['email'] : '',
                'facebook_profile' => $facebookUser['link'],
                'addr_city' => $address[0],
                'addr_country' => isset($address[1]) ? $address[1] : 'BR',
                'avatar' => 'avatar.jpg'
            )
        );
        
        if ( $this->User->save( $user ) ) {
            
            $user = $this->User->read(null, $this->User->id);
            
            if ( isset($facebookUser['photo']) && !empty($facebookUser['photo']) ) {
                if ( !$this->__saveImageFromFacebook( $facebookUser['photo'], $user['User']['id'] ) ) {
                    $this->User->saveField('avatar', '');
                }
            }
            
            if ( $this->Auth->login($user['User']) ) {
                $this->Session->setFlash(
                        '<b>Seu cadastro realizado com sucesso mas ainda não sabemos se você é um aluno ou professor, 
                            por favor informe-nos isto agora</b>', 
                        'default', array('class' => 'alert alert-info'));
            }
        } else {
            $this->Session->setFlash('Não foi possível realizar seu cadastro', 'default', array('class' => 'alert alert-error'));
            $this->redirect('/login');
        }
        
        return true;
    }
    
    
    /**
     * 
     * @param type $url
     * @return string
     */
    private function __saveImageFromFacebook( $url, $userId )
    {   
        $dir = 'files/users/'.$userId;
        
        if($imgOrigem = imagecreatefromjpeg($url)) {
            
            $x = imagesx ($imgOrigem);
            $y = imagesy ($imgOrigem);
            $imgFinal = imagecreatetruecolor ($x, $y);
            
            imagecopyresized($imgFinal, $imgOrigem, 0, 0, 0, 0, $x, $y, $x, $y);
            
            if( !is_dir($dir) ) {
                mkdir($dir);
            }
            
            imagejpeg ($imgFinal, $dir.'/avatar.jpg');
            imagedestroy($imgOrigem);
            imagedestroy($imgFinal);
            
            return 'avatar.jpg';
        }
        
        return '';
    }
    
    /**
     * 
     */
    public function logout($noRedirect = false)
    {
        if (class_exists('Facebook') ) {
            $facebook = new Facebook(array(
                'appId' => Configure::read('facebookAPI.appId'),
                'secret' => Configure::read('facebookAPI.secret')
            ));
            $facebook->destroySession();
        }
        
        $this->Auth->logout();
        if (!$noRedirect) {
            $this->redirect('/');
        }
    }

}