Summary. At the time of this posting (1615 CT USA) Twitter is down for maintenance. We will provide an update when services are restored.
Background. According to a report at Forbes.com, the maintenance outage today was originally scheduled for Monday but it had been delayed due to the crisis in Iran. The following statement was provided in an Associated Press report:
The State Department this week asked Twitter to postpone a scheduled maintenance shutdown of its service to keep information flowing from inside Iran amid the growing crisis over its disputed election, three U.S. officials said Tuesday.
Updates. We will provide updates on the situation as we have them.