Implmentation of "janrain User Management"

We integrated the "Janrain User" API on NOPC 1.7 We get  successfullly register the user to NOPC+Janrain but problem we are encounter with the user not get logged on the site. They need to enter the NOPC site from the Login control.

Can any body did any integration of user management either with facebook or anything. How we can keep user logged in after get register from Janrain.


Thanks,
-Ajit