BGH_

FOUND THE WAY TO FIX IT! BACKUP FIRST AND EDIT AT YOUR OWN RISK

After struggling a lot, finally, I found a workaround, or somehow. On social/lib/social/service.php look for line 297, and you should do this:

Find:

case '{url}':
					$url = social_get_shortlink($post->ID);
					if (empty($url)) {
						$url = home_url('?p='.$post->ID);
					}
					$url = apply_filters('social_broadcast_permalink', $url, $post, $this);
					$content = esc_url_raw($url);
					break;

Replace to:

case '{url}':
					$url = social_get_shortlink($post->ID);
					if (empty($url)) {
						$url = get_permalink($post->ID);
					}
					$url = apply_filters('social_broadcast_permalink', $url, $post, $this);
					$content = esc_url_raw($url);
					break;

This way Twitter will still use the shortlink (site.com/?p=2223), but Facebook will broadcast your own permalink on the Facebook wall :D.

Issue marked as resolved!

Without this stuff sorted out, and not even showing the author’s Facebook name (didn’t had the chance to try with Twitter), showing ‘Anonymous’ as author name, this plugin is rather futile at this current state.

Uninstalling this, as I post this.

Will re-install, when this get a better, proper update to work.

Regards.

Found the solution myself. Just modified the code on the initial post by adding <?php $i = 0; ?> above the wp_list_comments function. And then modified the custom_comments function and added the following:

function custom_comments($comment, $args, $depth) {
		global $SMTheme, $i;
		$i++;

I was messing around with <?php foreach ($comments as $comment) : ?>, but it is not necessary after WordPress 3+ versions.

This article enlightened me on the path to solution: http://www.zubair.info/blog/2010/11/13/adding-numbers-to-your-wordpress-comments.html

Hope this is useful for everyone struggling with this problem!

Best regards.