YouTube took its Ad Blitz channel live Friday, curating previews of upcoming Super Bowl ads instead of waiting for ads to air. The channel, which started with clips from Butterfinger, Doritos, Intuit, Pepsi and Squarespace, is an example of advertisers using social media sites to build extended hype. "What used to be a one-day event... is now an eight- to 13-week experience," said Google's vice president for brand solutions, Lucas Watson.

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