Everyone’s reacting today to Greek Prime Minister George Papandreou’s startling decision to hold a referendum on the deal cut last week to save his country’s economy. The agreement is unpopular — lenders would wipe out about half of Greece’s debt if the country accepts austerity measures that would cut social services. The fear is that a Greek default on its debt would have a ripple effect, pulling down other troubled economies.

Media stocks are falling along with the overall market. At mid-day, the Dow Jones Media Index is -1.6%. Sony’s been the hardest hit of the industry’s big guns with shares down 12%. Here’s how the others are faring: Disney -7.6%, Viacom -7.4%, CBS -5.6%, Time Warner -4.5%, News Corp -4.4%,  and Comcast -2.4%. Media companies down double-digits include Entercom (-13.4%), IMAX (-11.9%), and Gannett (-10.9%). The only gainers thus far are Time Warner Cable (+2.4%), Regal (+1.9%), Lionsgate (+1.6%), and Pandora (1.1%).

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