contact import from major mail providers and social netw.

hi dear, i want a contact grabber for our social networking portal so i need which can grab contacts from all major email providers like gmails,yahoo,aol,msn,rediff,[login to view URL] and other social networking sites like orkut,facebook,linkedin. if any body have readymade tool for this can contact .we required this tools in asp.net with c# .i need source code also.