Popular sites/apps such as Instagram, Airbnb, Flipboard, Twitter's Vine, and Amazon's Audible were affected.
Fast-growing AWS, which is now making stronger efforts to attract enterprise clients, has periodically witnessed outages (I, II). A Christmas eve outage led some top clients to reconsider their dependence on the platform.
Amazon's main site was hit by an outage a week ago. AWS was unaffected by it.