Twitter was scheduled to go down for scheduled maintenance today, but it was postponed at the request of the State Department:
Confirmation that the U.S. government had contacted Twitter came as the Obama administration sought to avoid suggestions it was meddling in Iran's internal affairs as the Islamic Republic battled to control deadly street protests over the election result.
....Twitter Inc said in a blog post it delayed a planned upgrade because of its role as an "important communication tool in Iran." The hour-long maintenance was put back to 5 p.m. EDT/2100 GMT, which corresponds to 1:30 a.m. on Wednesday in Iran.
Fascinating. The original upgrade schedule would have cut service in the middle of the day in Tehran.
Via Sullivan, of course.