Wordpress Custom Taxonomy Help

 public static function update($post_ID)    {
        //If this time Microblog Poster is disabled return immediatelly
    if ($_POST['microblogposteroff'] == "on")
        {
            return;
        }
        
        
        $post_categories = wp_get_post_categories($post_ID);
        
        if(is_array($post_categories) && !empty($post_categories))
        {
            $excluded_categories_name = "microblogposter_excluded_categories";
            $excluded_categories_value = get_option($excluded_categories_name, "");
            $excluded_categories = json_decode($excluded_categories_value, true);
            if(is_array($excluded_categories) && !empty($excluded_categories))
            {
                foreach($excluded_categories as $cat_id)
                {
                    if(in_array($cat_id, $post_categories))
                    {
                        return;
                    }
                }
            }
        }
        
        
        $post = get_post($post_ID);
        $post->post_content = strip_tags($post->post_content);
        $post->post_content = preg_replace("|(\r\n)+|", " ", $post->post_content);
        $post->post_content = preg_replace("|(\t)+|", "", $post->post_content);
        $post->post_content = preg_replace("|\&nbsp\;|", "", $post->post_content);
        $post_content_actual = $post->post_content;
        $post_content_actual_lkn = substr($post_content_actual, 0, 300);
        
        
        $post_thumbnail_id = get_post_thumbnail_id($post_ID);
        $featured_image_src = '';
        if($post_thumbnail_id)
        {
            $image_attributes = wp_get_attachment_image_src($post_thumbnail_id, 'thumbnail');
            $featured_image_src_thumbnail = $image_attributes[0];
            $image_attributes = wp_get_attachment_image_src($post_thumbnail_id, 'medium');
            $featured_image_src_medium = $image_attributes[0];
        }
        
    $post_title = $post->post_title;
        $post_title = substr($post_title, 0, 110);
        if(strlen($post_title) == 110)
        {
            $post_title = substr($post_title, 0, strrpos($post_title, " "));
            $post_title .= "...";
        }
        $permalink = get_permalink($post_ID);
    $update = $post_title . " $permalink";
        
        $post_content = array();
        $post_content[] = home_url();
        $post_content[] = $post_title;
        $post_content[] = $permalink;
        
        $bitly_api = new MicroblogPoster_Bitly();
        $bitly_api_user_value = get_option("microblogposter_plg_bitly_api_user", "");
        $bitly_api_key_value = get_option("microblogposter_plg_bitly_api_key", "");
        $bitly_access_token_value = get_option("microblogposter_plg_bitly_access_token", "");
        if( ($bitly_api_user_value and $bitly_api_key_value) or $bitly_access_token_value )
        {
            $bitly_api->setCredentials($bitly_api_user_value, $bitly_api_key_value, $bitly_access_token_value);
            $shortened_permalink = $bitly_api->shorten($permalink);
            if($shortened_permalink)
            {
                $update = $post_title . " $shortened_permalink";
                $permalink = $shortened_permalink;
                $post_content[] = $shortened_permalink;
            }
        }
    
    
    $tags = "";
    $posttags = get_the_tags($post_ID);
    if ($posttags) {
        foreach($posttags as $tag) {
            $tags .= $tag->slug . ','; 
        }
    }
    $tags = rtrim($tags,',');
        
        @ini_set('max_execution_time', '0');
        
        MicroblogPoster_Poster::update_twitter($update, $post_content, $post_ID);
        MicroblogPoster_Poster::update_plurk($update, $post_content, $post_ID);
    MicroblogPoster_Poster::update_delicious($post_title, $permalink, $tags, $post_content, $post_ID);
        MicroblogPoster_Poster::update_friendfeed($post_title, $permalink, $post_content, $post_ID);
        MicroblogPoster_Poster::update_facebook($update, $post_content, $post_ID, $post_title, $permalink, $post_content_actual_lkn, $featured_image_src_thumbnail);
        MicroblogPoster_Poster::update_diigo($post_title, $permalink, $tags, $post_content, $post_ID);
        MicroblogPoster_Poster::update_linkedin($update, $post_content, $post_ID, $post_title, $permalink, $post_content_actual_lkn, $featured_image_src_medium);
        
        MicroblogPoster_Poster::maintain_logs();
    }

-----------------

I'm guessing that this is the lynchpin and I need to somehow weave some arguments into the line:

  $post = get_post($post_ID);

Any ideas?