Not bad looking for a seamless integration.
In my experiences most users want a SSO (single sign on) approach to usernames and passwords. (Log on once, and it works everywhere.)
- Many use Facebook, Twitter, Instagram, or (insert FAV on-line service) to speed up the registration process.
I would test the operations of FB / VB interactions with user login. (cookies, simple FB register / login)
Logging in and out of VB and FB in all possible ways to see if there are errors generated or problems unforeseen.
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