If facebook_restrict is enabled, users won't be able to pull from FB. If facebook_restricted is then disabled, would FB contact integration be enabled next time FB contacts are polled? Or, would individual users have to reconfigure their Facebook connector?
In fact it does not disable the Facebook connector. It restricts the ability to syncronise your friends and conversations and make all your Facebook friends indistinguishable from your other "free web" friends.
You can still "post to Facebook".
When I said it won't poll, I was using shorthand, I thought everybody in that thread would have seen this comment, but it's one of the ones that got destroyed with restoring the backup.
New users won't be able to use the linking option in the settings. Remove the plugin, and they'll be able to use it again. Temporarily remove it, let your friends use it, and close it again and it'll work fine too.