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Facebook and Facebook-owned apps Instagram and WhatsApp were up and running again late Monday after being hit by an outage that affected users around the world. The social media giant said the disruption to network traffic "had a cascading effect on the way our data centres communicate, bringing our services to a halt." It said there is no evidence that user data was comprised. It was the largest such outage ever tracked by the web monitoring group Downdetector, which collates complaints about web outages.