The EasySocial registration flow should be pre-filled with whatever data can be fetched from the social network for the user. Please note the following caveats however:
* If the user's email address is already associated with a Joomla account, the email won't be pre-filled
* Every social network has different fields that can be imported. You won't be able to get all the EasySocial profile fields pre-filled.
With that said, please confirm that the fields are configured to be imported in the "Profiles -> EasySocial" area of JFBConnect. If it's still not importing, we can investigate if something changed on EasySocial's end that we need to update to work with.
Thanks,
Alex