function bp_activity_action_mentions_feed() {
	if ( ! bp_activity_do_mentions() ) {
		return false;
	}

	if ( ! bp_is_user_activity() || ! bp_is_current_action( 'mentions' ) || ! bp_is_action_variable( 'feed', 0 ) ) {
		return false;
	}

	$link = trailingslashit( bp_displayed_user_domain() . bp_get_activity_slug() . '/mentions' );

	// Setup the feed.
	buddypress()->activity->feed = new BP_Activity_Feed( array(
		'id'            => 'mentions',

		/* translators: 1: Site Name 2: User Display Name */
		'title'         => sprintf( __( '%1$s | %2$s | Mentions', 'buddypress' ), bp_get_site_name(), bp_get_displayed_user_fullname() ),
		'link'          => $link,

		/* translators: %s: User Display Name */
		'description'   => sprintf( __( "Activity feed mentioning %s.", 'buddypress' ), bp_get_displayed_user_fullname() ),
		'activity_args' => array(
			'search_terms' => '@' . bp_core_get_username( bp_displayed_user_id() )
		)
	) );

	if ( ! buddypress()->activity->feed->enabled ) {
		bp_core_redirect( $link );
	}
}