Facebook says one of the biggest outages in its history was caused by a "server configuration change." On Wednesday the Silicon Valley tech giant's apps went down across the world for hours. In a statement, a spokesperson said that "we made a server configuration change that triggered a cascading series of issues." While occasional outages of Facebook's services are not unheard of, this one was unprecedented in scope — causing mass disruption for most of a business day as the company scrambled to fix the issue.


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