Hippopost, a Canadian startup, sees a business opportunity in the 2 billion postcards mailed by Americans in 2008. The company lets consumers create custom postcards online, then send them without buying a stamp. In exchange, the card is framed with a local ad targeted by the recipient's address and chosen by the sender. "It's user-created content meets user-selected advertising," says Hippopost chief Donal Byrne.
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