Index: bbp-includes/bbp-user-functions.php
--- bbp-includes/bbp-user-functions.php
+++ bbp-includes/bbp-user-functions.php
@@ -314,6 +314,9 @@
 		if ( empty( $user_id ) )
 			return false;
 
+		if ( $favorites = apply_filters( 'bbp_pre_get_user_favorites_topic_ids', false, $user_id ) )
+			return $favorites;
+
 		$favorites = (string) get_user_meta( $user_id, bbp_get_favorites_key(), true );
 		$favorites = (array) explode( ',', $favorites );
 		$favorites = array_filter( $favorites );
@@ -644,6 +647,9 @@
 	if ( empty( $user_id ) )
 		return false;
 
+	if ( $subscriptions = apply_filters( 'bbp_pre_get_user_subscribed_topic_ids', false, $user_id ) )
+		return $subscriptions;
+
 	$subscriptions = (string) get_user_meta( $user_id, bbp_get_subscriptions_key(), true );
 	$subscriptions = (array) explode( ',', $subscriptions );
 	$subscriptions = array_filter( $subscriptions );