<?php

function facebook_comments_removeog_html_head_alter(&$head_elements) {
  
  $metas = array();
  if(  ISSET($head_elements['meta-fcb']["#markup"])  ) {
    $metas_temp = explode('<meta', $head_elements['meta-fcb']["#markup"]);
    foreach($metas_temp as $meta) {
      if( trim( $meta ) != '' && strpos($meta, 'property="og:') <= 0 ) {
        $metas[] = '<meta' . $meta;  
      }
    }
    $head_elements['meta-fcb']["#markup"] = implode('', $metas);
  }
  
}