+ * Taken from https://developers.facebook.com/docs/graph-api/advanced/rate-limiting?locale=en_US#faq
+ * I'm seeing Error Code 613, what do I do?
+ * If your error response contains error_subcode 1996, Facebook has noticed inconsistent behavior in the API request volume of your app. If you have made any recent changes that affect the number of API requests, you may be encountering this error.
+ * If you do not see the subcode, your app is exceeding a custom rate limit. Please contact your Partner Manager for help resolving this issue.