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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

The ads are selected to match the subject matter of the e-mail, with Google's ad-placement software picking up on certain key words.

ECONOMIST: Now they have assumed power, what will consumers do with it?

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

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