Using YouTube videos and old-fashioned lobbying, Google launched a campaign Monday to mobilize public support for opening up unused portions of the TV spectrum for unlicensed Internet devices and expanded broadband access.

Google executives and community activists said the online campaign is designed to enlist consumers in what has been a largely technical debate, with billions of dollars at stake, over how to use valuable chunks of “white spaces” on the spectrum when TV broadcasting shifts entirely to digital in February.

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