allow public comments (sort of - see the notes)

include/items.php

@@ -234,11 +234,10 @@ function can_comment_on_post($observer_xchan, $item) {
 				return true;
 			break;
 		case 'public':
-			// We don't allow public comments yet, until a policy
-			// for dealing with anonymous comments is in place with
-			// a means to moderate comments. Until that time, return
-			// false.
-			return false;
+			// We don't really allow or support public comments yet, but anonymous
+			// folks won't ever reach this point (as $observer_xchan will be empty).
+			// This means the viewer has an xchan and we can identify them.  
+			return true;
 			break;
 		case 'any connections':
 		case 'contacts':