BuddyPress.org

I have had problems installing this on WPMU 2.7 … The buddypress files go in mu-plugins/ but the fbconnect go into plugins/ ? I have had lots of problems with this install. I have ripped this all out to start again. Do I install to mu-plugins/ or plugins/ ? Is there a test I can run before I add the fbconnect part to be sure I have it all right before I install this? I have been doing fine up to this point, it seems; just wondering where I’m hanging up. Many thanks for the help.