Google Analytics is the best tool for seeing in depth analysis about your site. If you haven't signed up already, get your account now at http://google.com/analytics.

Using the link below, you can give your URLs specific parameters so you can watch the stats driven specifically from your storefront on Facebook. Remember though that Social Media REQUIRES engagement, so use this as a tool to determine how to get your products actively engaging your customers by featuring a product of the day, sharing specific products to your news feed, creating a discount for your fans etc..

http://www.google.com/support/analytics/bin/answer.py?hl=en&ans...