Notice bar at frontpage for multisite

Question

You can use the adminbar on front. Plus you can customize it to your needs.

Example on how to add a node

// Read here 1)
function nacin_promote_network_admin_in_toolbar( $wp_admin_bar ) {
    $wp_admin_bar->add_node( array(
        'id' => 'network-admin',
        'parent' => false,
    ) );
}
add_action( 'admin_bar_menu', 'nacin_promote_network_admin_in_toolbar', 25 );

^{1) Read on WPDevel how to add/remove_nodes in the admin bar.}