A major failure deep inside the bowels of Amazon’s EC2 infrastructure has taken several large websites offline. Quora, Reddit and Foursquare are among the sites affected. Foursquare appeared to be offline only briefly while the other sites were down for the better part of the day.
Customers began to receive emergency alert emails at 2:49 AM Pacific time; at 6:59 AM there was another update indicating some sites were back but others were still having problems.
For the emails and more color, see TG Daily