Oddball, edgy or simply entertaining, British commercials such as Cadbury's "Eyebrow Dance" dominate Advertising Age's Viral Video Chart. Experts chalk it up to the videos' broad appeal and strong creative. "You can buy your way into 1 or 2 million views, but beyond that you need content with an emotional power to connect with the end-user," said Scott Button of Unruly Media.

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