Hi Checksum,
I am sorry for the delay of this reply.
The whole purpose of using FBC is to login with FB, and not have to deal with another username and password.
I agreed that when login / register with FBC, user should not bother with another username and password. What EasySocial provide your user is the another way of accessing the site
Your user can safely discard the username / password generated by EasySocial
Anyway, if you do not want your user to receive another username / password, then you will need to customise EasySocial. I might able to assist you regarding this matter, if you are ok with this approach
Please advise.
Hope this help and have a nice day