Design - Users create sites which are viewable to other users and unregistered users.
ALL USERS register for the MAIN SITE. I don't want user-created sites to have their own users.
Single Login...all users created for Main Domain. I installed Simple Facebook Connect, and each site that exists on my network is being asked to enter Facebook API credentials.
Within my network I want all Registration and Login links to point to the mothership (main site).
Multi-Domains supports "single sign-on". I currently only have 1 domain, but think I may have others in the future. Should I use Multi-Domain to achieve the results I seek?