refresh diaspora xchan every month or so since receiving profile update messages from that network reliably are just as unlikely as receiving any other kind of message from that network reliably. The problem is that if somebody changes their profile name or photo once every few years and you miss it because of their shitty unreliable communications, your data could be stale for a long time.

include/items.php

@@ -3766,6 +3766,10 @@ function consume_feed($xml, $importer, &$contact, $pass = 0) {
 					$author['owner_avatar'] = $contact['thumb'];
 				}
 
+				if(! is_importable($datarray,$contact))
+					continue;
+
+
 				logger('consume_feed: author ' . print_r($author,true),LOGGER_DEBUG);
 
 				logger('consume_feed: ' . print_r($datarray,true),LOGGER_DATA);