1. Log in to Facebook, then click on the little arrow at the top right of the blue bar at the top of the page.
2. In the resulting drop down menu, click on Settings.
3. You should see "General Account Settings." Below the settings for name, username, etc., you should see a hyperlink in blue: Download a copy of your Facebook data. Click the blue hyperlink.
4. On the next screen, you should see a big green button that says "Start My Archive." Click it, re-enter your password when prompted, and you should be able to download your content.