Question:
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?
Answer:
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.