Comment by salvadors

You can export your friends' email addresses from Facebook to sites that they have a deal with - e.g. Yahoo Mail.

You can then export from there as CSV etc., and pull them into other services. I set up a one-time Ymail account just to try this out, and it worked just fine.

So any claims by Facebook that they can't do this due to users' privacy etc are completely bogus. It's just that Google won't give them money to do it.