How to invite Facebook, twitter, gmail friends into organic groups How can i invite Facebook, twitter,Gmail friends in to my Organic Groups in Drupal 6.
Is there any possibility about this. Let me know.
Thanks,
Thiru
You can make use of Contact Importer module.


  Contact Importer provides a form for your users to enter their email
  address and password. The contacts from their address book are then
  retrieved.


Of course you need to alter the module to send invites. 

Or 

Try using Rules Module with this, to make it a chained process.