How do I retrieve my contacts?

How can I retrieve contacts/emails from things like MSN, Twitter, Facebook, GMail , etc...?

• I'm building an application that gives users the option to send out an email notification to their friends. The options I would like to give them for this are to: manually write down which emails they would like to send to choose contacts from a list of ones already in the database for that user choose all contacts from facebook, twitter, digg, gmail, or msn to send the email to Is there any way I can retrieve all of the email addresses for a certain contact from these different websites? For example, if I chose the option to send out email notification and I wanted to send it to all of my friends on my facebook account, how could I do this? (Remembering that the user is interacting with a completely separate website and should not have to go onto facebook to send this emails) Any ideas? Thanks in advance for your help! Matt

• Answer:

  Google contacts api: http://code.google.com/apis/contacts/ Windows Live contacts api: http://msdn.microsoft.com/en-us/library/bb463989.aspx Facebook's apis are here: http://wiki.developers.facebook.com/index.php/API