Facebook doesn’t share information with anyone,so there is no option to export the email ids of all your friends.There is a perfectly legal way to do so.
Steps to import email ids of all your Facebook contacts:
- Go to address.yahoo.com and below you will find a tool “Import your Contacts from other accounts to Yahoo!”
- Click on import now
- Click on the Facebook icon.now a dialog box will pop out asking you whether you want to share your contacts with yahoo.select okay
- It will start retrieving data from Facebook.after its completed click on done.
- Click on tools option and select export or you can directly go to Export Contacts
- There are various ways to Export.select your preferred method.