The most popular TV show of fall 2014 was NBC's broadcast of "Sunday Night Football." It averaged 21 million viewers per week. The strongest cable show was AMC's "The Walking Dead." Its midseason finale, in November, reached 14.8 million people. Big numbers, right? Try this one: 24.79 million. That is the number of people who, on the evening of January 26, 2015, and over the next 24 hours, watched a video broadcast on their phones depicting the sights and sounds of New York's "Snowpocalypse." Unlike "Sunday Night Football" and "The Walking Dead," the camera operators for the "Snowpocalpyse" broadcast were not professionals.