module.config.php

<?php
return array(
    'di'     => array(
        'instance'  => array(
            'aliases' => array(

				// services
	            'facebook_service' => 'Facebook\Service\Facebook'
            ),

	        'facebook_service' => array(
		        'parameters'   => array(
			        'config'   => array(
						'appId'  => 126740477459689,
				        'secret' => '4b0ced413b4618cdc17b4d1847335c87'
			        ),
		        )
	        ),

	        'Zend\View\HelperLoader' => array(
		        'parameters' => array(
			        'map' => array(
				        'fb' => 'Facebook\View\Helper\Facebook',
			        )
		        )
	        ),

            'Facebook\View\Helper\Facebook' => array(
                'parameters' => array(
                    'service' => 'facebook_service'
                )
            ),
        )
    ),

	'view_manager' => array(
		'helper_map' => array(
			'fb' => 'Facebook\View\Helper\Facebook'
		)
	)
);