// valori di default
$og_default_page_id 	= '';
$og_default_app_id 	= '';
$og_default_admin_id 	= ''; // richiesto
$og_default_img 	= ''; // richiesto
$og_default_author 	= '';

/* ------------------------------------------------------------------------------ */
/* metatag open graph
/* ------------------------------------------------------------------------------ */
function s_fb_metatag($og_page_id = '',$og_app_id = '',$og_admin_id = '', $og_img = '', $og_author = '') {
	global $post, $og_default_page_id, $og_default_app_id, $og_default_admin_id, $og_default_img, $og_default_author;
 
	if (trim($og_page_id) == '') 	$og_page_id 	= $og_default_page_id;
	if (trim($og_app_id) == '') 	$og_app_id 	= $og_default_app_id;
	if (trim($og_admin_id) == '') $og_admin_id	= $og_default_admin_id;
	if (trim($og_img) == '') 	$og_img		= $og_default_img;
	if (trim($og_author) == '') 	$og_author	= $og_default_author;
 
	if ($og_author == '') {
 
		// parte relativa all'autore
		$og_author = get_the_author_meta('first_name', $post->post_author). ' ' .get_the_author_meta('last_name', $post->post_author);
 
		if (trim($og_author) == '')
			$og_author = get_the_author_meta('nickname', $post->post_author);
	}
 
	$og_sname	= get_bloginfo('name');
	$og_title 	= (is_single() || is_page()) 	? single_post_title('', false) 	: get_bloginfo('name');
	$og_url 	= (is_single() || is_page()) 	? get_permalink() 				: get_option('home');
	$og_author	= (is_single() || is_page()) 	? $og_author 					: '';
	$og_type	= (is_single() || is_page()) 	? 'article' 					: 'blog';
	$og_desc	= (is_single()) ? substr(preg_replace( '/\s+/',' ',strip_tags($post->post_content)),0,500) 	: get_bloginfo('blogname');
 
echo <<<DATI
 
	<!-- cazzilli metataggosi di facebook - set minimo richiesto -->
	<meta property="og:title" content="$og_title" />
	<meta property="og:url" content="$og_url" />
	<meta property="og:image" content="$og_img" />
	<meta property="og:site_name" content="$og_sname" />
	<meta property="og:type" content="$og_type" />
	<meta property="og:description" content="$og_desc" />
	<meta property="fb:admins" content="$og_admin_id" />\n
DATI;
 
if (trim($og_author) != '')
	echo "\t" . '<meta property="og:author" content="' .$og_author. '" />' . "\n";
 
if (trim($og_page_id) != '')
	echo "\t" . '<meta property="fb:page_id" content="' .$og_page_id. '" />' . "\n";
 
if (trim($og_app_id) != '')
	echo "\t" . '<meta property="fb:app_id" content="' .$og_app_id. '" />' . "\n";
 
}
 
/* ------------------------------------------------------------------------------ */
/* condivisione facebook
/* ------------------------------------------------------------------------------ */
function s_fb_likebutton($sfb_ref='none',$sfb_layout='button_count',$sfb_faces='false',$sfb_width='100',$sfb_verb='',$sfb_color='') {
 
	// layout: standard, button_count, box_count
	$layout	= '';
	$width 	= '';
	$verb	= '';
	$color	= '';
 
	if (trim($sfb_layout) != 'standard')
		$layout = ' layout=\"' .$sfb_layout. '\" ';
 
	if (trim($sfb_width) != '')
		$width = ' width=\"' .$sfb_width. '\" ';
 
	if (trim($sfb_verb) != '')
		$verb = ' action=\"recommend\" ';
 
	if (trim($sfb_color) != '')
		$color = ' colorscheme=\"dark\" ';
 
	if (trim($sfb_send) != '')
		$send = ' send=\"' .$sfb_send. '\" ';
 
	echo '<iframe src="http://www.facebook.com/plugins/like.php?href=' .get_permalink(). '&amp;'.$layout.'show_faces='.$sfb_faces.'&amp;'.$width.''.$verb.''.$color.'height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden;'.$width_px.' height:80px;" allowTransparency="true"></iframe>';
 
}