I have a client who has a site that is similar to a social networking site, but that would like to have the facebook email-grab facility that is currently offered.
The user would submit their username, gmail yahoo or hotmail extension and the routine you would originally write would go to these sites and grab the emails, back for the user to select addresses, and then would have the ability to send invites to join the site via an email link.
Bids are invited to anyone who is professional and competent to do this. I will pay much extra those who are professional and efficient, and the service would be heavily tested to ensure it is optimised to work successfully.
Please please please don't waste time by bidding on this if it is not possible for you to complete to a sensible timescale, or is beyond your capabilities!
Further details and information is available on request.