add_action(
   'friends_current_site_menu_top',
    function(
        $wp_menu,
        $my_url,
        $my_admin_url
    ) {
        // Your code here.
    },
    10,
    3
);

do_action( 'friends_current_site_menu_top', $wp_menu, $my_url, $my_admin_url )