Using Facebook's graph-API I can get various data from the user who is logged into my system (the full list can be seen on Facebook's doc). However, I would like to know if there is a way to get the data from my friends, to be more specific, the email.
I know that I can use taggable_friends to tag friends who don't use my application, and invitable_friends to invite friends (if using canvas). However, in none of these ways can I retrieve the friend's email?
Large companies such as Yahoo are able to carry out this import of emails. Is it possible to accomplish this via the facebook API?
Unfortunately Facebook has restricted some functionality in order to maintain user privacy. As a result, it is not possible to obtain the email in the desired way.
Large companies have a "deal of lords" to obtain this data, which is normal for any large API on the market.