In a desperate attempt to keep up with the times, Billboard decided to introduce an algorithm to its popularity contest that allows YouTube video plays to count toward being the number-one song in the country, and guess what: “Harlem Shake” is now our nation’s number-one song. Wonderful news. News that should make you violently shake for, say, 15 seconds. But only after silently staring at your computer screen for about 15 seconds …