How do you invite friends to answer your questions on yahoo answers?

Yahoo answers seams to want your friends e-mail addrees and I don't know any of them but they seam to know mine.
How do you invite friends to answer your questions on yahoo answers?
when a question is posted there's this little envelope icon. this will allow you to email that question to your friends.





if you have contacts on y!a, they will see your questions and when you star them.
Reply:You can add any open questions to your Yahoo IM so your friends can see them. You can click on a persons avatar and contact them via e mail or IM (if they allow it) and if you add a person as a contact they can follow your latest questions and answers.