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Once they're tweeted -- be it by a journalist or a rival politician -- they become TV ad, direct mail, and attack e-mail fodder.

CNN: The danger of Twitter, Facebook politics

With just a single magazine ad, he has already received 500 mail orders.

CNN: ASIANOW - TIME Asia | INDIA: The Spoils of War

But the carmaker knows a lot more than any TV ad can provide: their e-mail addresses and zip codes, for starters, which Chrysler forwards to local dealers.

FORBES: Magazine Article