Importing Facebook and Twitter contacts in ASP.NET

I don't know about twitter, but regarding facebook you can get some data from user friends like name, pictures ...,
but it is imposible to get email from user friends. It is possible to get friends list by using facebook c# sdk. Here
is an live example:  http://demo.vatlab.net/DataAccess.aspx

Both facebook and twitter gives the API to get the friends, etc..m from your application.

For import the facebook friends list:
http://vatlab.com/asp-net-facebook-controls/invite-friends

For twitter:
http://morewally.com/cs/blogs/wallym/archive/2009/03/17/calling-the-twitter-api-in-c.aspx
https://dev.twitter.com/docs/open-source-examples