The main feature is that Facebook Connect is allowing your customers to log into your store, just using Facebook account. It is fast, safe and reliable. Moreover, people will often use a few clicks instead of filling the forms, what increasing the number of successful registrations. The Log In button can be customized in the backend in order to suit your store design.The button, generally found in header, is present on login page.The Login feature is absolutely standard and it is always helpful to all Magento stores - both as a free advertisement feature and as an ordinary people interest measurer.