Cable nets and a larger-than-expected share buyback plan were the stars of Viacom’s earnings. Cable revenue rose 14% to $1.7bln, driven by strong ad sales. Overall, the company posted a net loss of $487.6mln, compared with a year-ago profit of $699.6mln. Chalk up the loss to a $1.5bln charge related to Blockbuster. Total revenue grew 4%, to $5.5bln. Wall St welcomed news of the planned $8bln buyback.