Facebook is a popular website used primarily for networking and keeping in touch with loved ones. Facebook has many uses, including, but not limited to, finding someone's email address. This is quite easily done considering the person whose email address you're looking for does not have it set to private.
Log in to your Facebook account by going to Facebook.com. At the top of the screen type in your email address and your password then click "Login." If you don't have a Facebook account, fill in the information under "Sign Up" and click "Sign Up."
Type the name of the person whose email address you want to find in the search bar at the top of the screen and press "Enter" on your keyboard.
Click on the "Info" tab at the top of the screen and scroll down to the bottom until you get to the "Contact Info" section. In that section you'll see the email address along with phone numbers, addresses, websites and the city in which the person resides.