Techniques to allow a social networking system to import contact information from an external system. In one embodiment, a QR code is provided to a non-mobile computing device to allow a log in to an external system by a user using a mobile computing device. Information from the external system is received after authentication of the user with the external system. The information includes address book information of the user. The address book information includes contact information maintained by the external system. Invitations are provided to a selection of the new contacts to join the social network of the user.