<iframe width="560" height="315" src="http://www.youtube.com/embed/..." frameborder="0" allowfullscreen></iframe>

but WordPress prohibits the inclusion of iframes in the standard configuration.

I found an easy way to change this.

1. You have to change your function.php, so go to “Appearance” -> “Editor” and open the function.php in the integrated wordpress editor. But be careful and if you’re don’t know what you are doing, I advise you to make a backup or ask someone.
2. Look in the code if there is already a row in which the filter “add_filter(‘tiny_mce_before_init’, …); is applied. If not, add the following code:
   /*Add iframe to TinyMCE*/
function fb_change_mce_options($initArray) {
$ext = ' iframe[align|longdesc|name|width|height|frameborder|scrolling|marginheight|marginwidth|src]';
if ( isset( $initArray['extended_valid_elements'] ) ) {
$initArray['extended_valid_elements'] .= ',' . $ext;
} else {
$initArray['extended_valid_elements'] = $ext;
}
return $initArray;
}
add_filter('tiny_mce_before_init', 'fb_change_mce_options');

3. That’s it. Now you can use the new Youtube integration code by posting it into an articles html.

Now that the Google+ Button is available to use, I had the idea to integrate it into my WordPress Plugin. A little bit of linklove can not be wrong and SEO is important, also to spread an open source product.
Here you can read about what to do so.

First of all, the +-Button consists of two parts:

• The plusone.js script in the html head.
  <script type=”text/javascript” src=”https://apis.google.com/js/plusone.js”></script>
• And the button place holder
  <g:plusone size=”small” count=”false” href=”http://your-domain-to-like.com”></g:plusone>

Both parts can easily integrated with standard wordpress functions.

To add the script into the wp-admin head you can use this code:

function set_admin_header() {
  //admin Header
  wp_deregister_script(array('plusone'));
  wp_register_script( 'plusone', 'https://apis.google.com/js/plusone.js');
  if (function_exists('wp_enqueue_script')) {
    wp_enqueue_script('plusone');
  }
}
add_action('admin_init', 'set_admin_header');//admin_init, admin_head is to late

For integration in a plugin-class, use this instead:

$classObj = new myClass();
add_action('admin_init'   , array($classObj,'set_admin_header'));

Then you need to integrate the button into the plugins overview / wordpress installed plugins list.

/* Add a link to plugins page */
function set_plugin_links($links, $file) {
  $plugin = plugin_basename(__FILE__);
  if ($file == $plugin) {
    return array_merge( $links, array(
      '<g:plusone size="small" count="false" href="http://your-domain-to-like.com"></g:plusone>'
    ));
  }
  return $links;
}
add_filter( 'plugin_row_meta', 'set_plugin_links', 10, 2 );

For integration in a plugin-class, use:

$classObj = new myClass();
add_filter( 'plugin_row_meta', array($classObj,'set_plugin_links'), 10, 2 );

After all, replace “http://your-domain-to-like.com” in my code with your url.

 I hope I could help you with my short tutorial. If so, please click on my + button