Despite largely stable expansion of cord cutting in Q1, Wall Street engaged in a rather steep sell-off of pay TV operator stock Friday after Charter Communications reported the unexpectedly high loss of 112,000 video customers. 

Charter had its worst day of trading in nearly a decade, with its stock down nearly 16% Friday. But Comcast, AT&T, Dish Network, Liberty Global and Cable One all had bad days, as well. 

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