Amazon blamed a “networking event” that “triggered a large amount of re-mirroring” of storage volume. The outage forced websites such as Foursquare, Reddit, Quora and Hootsuite offline Thursday. Amazon blames network problems in the US-EAST-1 region, based in northern Virginia. Amazon’s service-level commitment provides 99.95% availability for each region — but not for each availability zone. Gartner analyst Drue Reeves says Amazon hasn’t been transparent about these questions.”]