No further erroneous SMS messages have been sent, and this issue is resolved. We will be posting a postmortem with further details shortly.
Posted 4 days ago. Mar 13, 2018 - 15:49 PDT
We have determined that no further erroneous confirmation messages are being sent. We are continuing to examine the overall impact.
Posted 4 days ago. Mar 13, 2018 - 14:07 PDT
During a data migration, SMS subscription confirmation messages were erroneously sent to a set of phone numbers that were already subscribed to notifications from various pages. We are working to ensure that no further erroneous confirmations are sent. Those that did receive this message may disregard its call to action.
Posted 4 days ago. Mar 13, 2018 - 13:20 PDT
We have received reports of unexpected SMS notifications being sent. We are investigating this now and will update this incident with additional information as it becomes available.