Unless you choose a different option, when fans visit your Facebook page, it defaults to your Wall with just your posts showing. this option can be changed to default to one of the other tabs as well. Better yet, you can make it default to a Static FBML-language (think HTML) based landing page of your choosing.
Picture a Promotional Web Page for you or your business ON FACEBOOK and it does whatever you like. It is a tab on the page, but when visitors stop by, it’s the first thing they see.
Here’s how to set up a static landing page for your Facebook Fan Page http://ow.ly/18Vme.