From Facebook Developer Wiki

Connecting Facebook Users with Their Friends on Your Site
Once a user connects his or her accounts, as described above, you can help the user find her Facebook friends who are already on your site. 

This sentence doesn't make any sense in the context of what follows. If they are already using the site why would I need to send them an invitation to come use the site????? connect.registerUsers is designed as best I can tell to look for users who have not used your site.

--551551925 11:04, 27 October 2008 (PDT)

Good catch. There's an easier way to do this now. It's been fixed. -- Pete (User:563683308)

Thanks for the fix. Another issue.

Connecting Accounts When a User Sends a Connect Request
A user can receive a Connect Request from her friends who are already connected on your site.

How do I send a connect request exactly? Is this where we are supposed to use Fb:connect-form? I have had no luck with this widget - it displays nothing and I see other people in the forums have experienced the same problem. Could you document this connection request process in more detail and provide some images of what we should see. TheRunAround doesn't offer any help here either.--551551925 12:30, 28 October 2008 (PDT)

Create a table that maps a Facebook user ID to a your own internal account identifier.

Does this mean adding a whole new database table or add a databasefield into an exsiting one? Not quite sure how this is done, so an example would be very useful. User:594037515

Is there a working example of this approach and/or a step by step guide?