bp_activity_action_favorites_feed()

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

	// Get displayed user's favorite activity IDs.
	$favs = bp_activity_get_user_favorites( bp_displayed_user_id() );
	$fav_ids = implode( ',', (array) $favs );

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

		/* translators: User activity saved RSS title - "[Site Name] | [User Display Name] | Favorites" */
		'title'         => sprintf( __( '%1$s | %2$s | Favorites', 'buddyboss' ), bp_get_site_name(), bp_get_displayed_user_fullname() ),

		'link'          => bp_displayed_user_domain() . bp_get_activity_slug() . '/favorites/',
		'description'   => sprintf( __( "Activity feed of %s's saved posts.", 'buddyboss' ), bp_get_displayed_user_fullname() ),
		'activity_args' => 'include=' . $fav_ids
	) );
}