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Craigslist

Craigslist

www.craigslist.org
Unique visitors, January 2009: 22,251,000 (Nielsen Online)

The local classified ad site allows anyone to list items for sale.

Pros: Selling items on Craigslist is free.
Cons: Craigslist isnt an e-commerce platform, so there are no storefronts, shopping carts, payment systems, or other processes in place to handle sales.