Expo: "Expo is a dynamic social listing service that allows members to find and sell items, discover information, and meet other parties in their area � all for free!
With Expo, you can browse and post listings to those you trust, like your buddies, co-workers, and fellow students, or, to all Expo visitors.
In addition, you can map listings easily using MSN Virtual Earth, post a free listing in less than a minute with our easy-to-follow steps, and use instant messages to communicate quickly with other members.

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location based services