The letters will use a mix of messages, including some offering recipients a savings-account feature.

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Verizon Wireless also is taking a booth for the first time, and will feature some four dozen partners, including smartphone makers, chip makers and consumer-electronics companies.

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Many of the winning applications had some kind of social networking feature, including Life360, a location-based system that, among other things, allows users to form social networks with others in their neighborhood.

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