BuddyPress.org

You are correct. It is not ready to run on WP 2.9.x and BP 1.2.x. As this issue has been discussed in a number of other threads, your best option is to contact the authors directly. You will not get any support here.

Use the plugin that says autoconnect. It works great and is coded with BP in mind. https://wordpress.org/extend/plugins/wp-fb-autoconnect/

Instead for me it’s the only one that works very very well (and I have tried wp-fb-autocnnect, Gygia, simple fb connect, Facebook Connect to Adam Hupp, Faux Facebook Connect -only for comment- and others)!
The only ones that work (for me) are Gygia (but only if you have a normal WordPress installation) and BP-Facebook connect (there is a very little problem with logout redirect). And more, Bp-Facebook gets also the (facebook) email of user.
I don’t love its method to work, but it works.

I have Buddypress 1.2.3 and WordPress 3.0 beta 1 (network installation with subdirectory).
The very great problem that I have with Bp-Facebook (at the moment) is the incompatibility with WordPress MU Domain Mapping: if my secondary blog mantains subdirectory url, BP-facebook works (too well).
But if I change a subdirectory url with a primary url (example.com/secondaryblog to secondaryblog.com) it goes crazy.
And this is a problem!

I hope Peatling update his plugin!

I don’t know why, but WP-FB-Autoconnect (also this update version) doesn’t work for me: and there is only one other person that seem to have my same problem.
It’s a tragedy (((