Facebook presents a unique opportunity to connect with your target market in a way that your Web site cant. This Mashable articles suggests that the trick is coming up with meaningful content that people will want to share, and that brings them back again and again.
"Now, you can use Facebook to engage directly with your customers and make them part of your marketing efforts. For example, you can ask customers to share their successes on your wall and get feedback on new product features. You can encourage them to recognize great service people and reward them for their input with a discount or other promotion. You can also solicit customer references for case studies and media opportunities and find out whos doing something innovative with your product.
"BigCommerce, a company that offers e-commerce shopping cart software, routinely reaches out to its Facebook fan base to identify reference customers and uncover interesting use cases for the media. For example, when the company wanted to promote the success of its recently launched Facebook shopping application, they simply posted a query on their page asking which customers had seen a boost in sales from the application and who would be willing to talk to the media. Within 24 hours, the company had generated fifteen new customer references and were able to immediately turn this information into media coverage."