function bp_friends_register_widgets() {
	if ( ! bp_is_active( 'friends' ) ) {
		return;
	}

	// The Friends widget works only when looking an a displayed user,
	// and the concept of "displayed user" doesn't exist on non-root blogs,
	// so we don't register the widget there.
	if ( ! bp_is_root_blog() ) {
		return;
	}

	add_action( 'widgets_init', function() { register_widget( 'BP_Core_Friends_Widget' ); } );
}