You must first register an "application" on Facebook's website pointing to the integration file included with IP.Board 3. You then must enter some basic keys that Facebook provides in your ACP.
Users will have the ability to use Facebook Connect to login to your site. They will also have the ability to either associate their Facebook account with an existing IP.Board account, or create a new IP.Board account.
We have purposely kept the complexity of the various syncing options available through Facebook Connect to a minimum. We have many ideas on how we would like to expand the capabilities in the future, but we wanted to keep this integration basic for the time being.
Facebook Connect support will be available with the second beta release of IP.Board, and will be available on the preview site to test with beginning Monday.