It is.
Facebook apps require that you allow them to access your personal data that is in your facebook profile. In this case it seems to register you to the vBulletin install using this information. I completed the process and was auto connected with my Facebook ID.
Not sure if it really violates any copyrights or not, since it could be seen as an extreme example of bridging between two applications while using Facebook to host the forum files. However it does require a facebook account to even view it, and it does share data with the profile.
If you allow it access, you can remove that access later under the settings menu.
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