If I add a new account to Jitsi (File > Add New Account), select Facebook, and click "Advanced" many of the settings refer to Google (see attached).
For example, an option in the "Connection" tab says "Enable Google Contacts search." This setting, checked by default, appears to give Facebook access to my Google Contacts. Is this really what you mean? If this is what it does, I suggest having it unchecked by default.
After further investigation I discovered that the same UI is used for all XMPP accounts. In which case, I suggest removing the Google-specific language from the Advanced settings of non-Google accounts.
Since Jitsi is catering to privacy conscious users, appearances of privacy violations can turn users away. It was enough to stop me from signing in to Facebook using Jitsi (at least until I found out more information).
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