I'm using Simplenews module for sending newsletter to the registered users. When a user creates a new account he/she will be automatically subscribed to a newsletter which can be seen in admin/people/simplenews.
However, when user registers via social network he/she is not subscribed to newsletter. When I visit admin/people/simplenews I can see only the users registered in normal way; users registered through a social network cannot be seen.
I'm using HybridAuth for Twitter & Google+ login and Fboauth for Facebook login. In simplenews configuration, I've used silent setting. What can I do to make users sign up to a newsletter on social network registration?