iPhone Life magazine

Anttenna — free app uses GPS to serve up classifieds based on your location

This is a cool idea. Anttenna (free) uses GPS to let you find classified listings nearby. It's built on top of Twitter and creates a mobile marketplace for exchanging goods using bite-sized Twitter-style postings they call Anttweeting. You can also chat with people who have items for sale. As always, a service like this depends on lots of people using it, but they seem to be off to a solid start. It's using state-of-the-art social networking to facilitate local exchange. Read more on their website.

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Jim Karpen's picture

Jim Karpen holds a Ph.D. in literature and writing, and has a love of gizmos. His doctoral dissertation focused on the revolutionary consequences of digital technologies and anticipated some of the developments taking place in the industry today. Jim has been writing about the Internet and technology since 1994 and has been using Apple's visionary products for decades.