function tja_replace_avatar($avatar, $id_or_email, $size, $default, $alt)
{
    $user = tja_parse_user($id_or_email);
    if (!$user) {
        return $avatar;
    }
    $src = tja_get_avatar($user, $size, $size, true, false);
    if (!$src) {
        return $avatar;
    }
    return "<img alt='{$alt}' src='{$src}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
}
function tja_facebook_user_added($user_id)
{
    //add their about me to bio
    $user = tja_parse_user($user_id);
    update_usermeta($user->ID, 'user_bio', tja_get_facebook_about_me($user));
}
function tja_get_user_url($authordata = null)
{
    if (!$authordata) {
        global $authordata;
    }
    $authordata = tja_parse_user($authordata);
    return get_bloginfo('url') . '/users/' . $authordata->user_login . '/';
}