When you first start a Facebook Page, you obviously have very few fans. One way to acquire a lot of new fans is by leveraging your existing email lists.
Facebook Pages include two ways to link up your email lists to your Page:
1. Import an Excel or CSV file
In the “Marketing” tab in your admin panel, you’ll see a selection called “Tell Your Fans”. When you click on this, a new window will open up allowing you to import a database.
UPDATE: This option is now under the “Resources” tab
2. Synch with a web-based service
The other option in the pop-up window allows you to import email contacts from your web-based email service, like Gmail or Yahoo.