ShopTab's application runs inside of Facebook's domain as an i-frame application. This means that each product and shop page inside of Facebook does not have its own URL or link. However, ShopTab has created a URL for each product so that the product listings are available to promote in your Facebook page, PPC campaigns or other web posting as a hyperlink. This also allows mobile users to see the product when using Facebook's mobile app.
To easily retrieve the URL for each product, go to the product in your ShopTab store page, click on the Tweet button and copy and paste the URL from the dialog box.