If you’re looking for new customers, there’s a lot of people talking about your product / marketplace on Twitter. You can now find them easier with Tweet Scan. Search for your product name or marketplace and you can them send those people a message about your product.

Twitter can also be a great way to monitor customer satisfaction. Zappos.com, the online shoe store is using Twitter to monitor customer comments. They created a whole site dedicated to watching what customers have to say. It’s online at http://twitter.zappos.com. Check it out.