As the people behind the KONY 2012 video know, it's not easy to come up with a sequel to a hugely viral video.
Yet Evian managed to do that this year with "Baby & Me," a continuation of the theme started in its hugely successful "Roller Babies" ad from 2009. Perhaps the trick was to hew to the same idea, but expand upon it. Or maybe people just like babies.
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You can go crazy trying to figure out why some of the videos on YouTube's most-viewed ads of 2013 list took off. For example, why were people so jazzed about a woman talking about poo? Another mystery is why this list looks so different from Unruly's most-shared ads of 2013. Are people viewing these ads but not sharing them?
One thing is certain: Running a Super Bowl ad doesn't hurt your chances. Three spots from the big game make this list. Since some of the ads haven't made the rounds in months, it's likely that much of the activity came right around the February event.