Facebook generally the email is hidden to everybody. So anyone others email can not see. So today I would say that the process, How Find Hidden Email With Facebook Friends through you. To your friends you can find the hidden e-mail. It's a simple tricks, many pepole know this trick. Your need a Yahoo ID.
1st Step
Frist visit this link and click Contact Tab.
2nd Step
Then open a pages, there are marked in red, click Impost Contact.
3rd Step
Then you will see a pages. Here click on the Facebook Icon.
4th Step
Then open in the Window, here to Login with your Facebook ID.
5th Step
Then open to this page. Contact That was the Import. Click Done.
6th Step
Then the Contact Page to see the red marked place, there is your friend's name and email id Show.
When you complete all step, Then you are done, and finding your friends facebook email id.