Facebook Pages has a setting that allows you to choose which tab you want a non-fan to see when they first arrive at your Facebook Page.
You’d want to do this with a custom tab to create a good first impression with potential fans. A study last year by BrandGlue found that Pages with a custom landing tab increased their new fan conversion by 24%.
How to select a default tab
Under your "Manage Permissions" tab in your admin panel, select the tab you’d like non-fans to see.