/**
 * bp_groupblog_upgrade_user( $blog_id, $user_id, $group_id )
 *
 * Subscribes user in question to blog in question
 * This code was initially inspired by Burt Adsit re-interpreted by Boone
 */
function bp_groupblog_upgrade_user( $blog_id, $user_id, $group_id ) {
  global $blog_id;

    $blog_id = groups_get_groupmeta ( $group_id, 'groupblog_blog_id' );

    // If the group has no blog linked, get the heck out of here!
    if ( !$blog_id )
        return;

    // Setup some variables
...