Music videos don&amp;#8217;t have to be good to go viral on the Web &amp;#8212; in fact, they can be so bad that you can&amp;#8217;t help but stare slack-jawed at 3:48 of pure sh&amp;#8211; um, shenanigans. Case in point: The new video for &amp;#8220;Friday&amp;#8221; by Rebecca Black, which exploded over the weekend as people found what [...]