| | Publishing | Closed community | Open community
|
| Users can register | No | No | Yes
|
| Communication | One to many | Many to many | Many to many
|
Publishing
Publishing/Brochureware with User-generated content (UGC), but clear what is official vs user-contributed e-commerce
Intranet, Closed team collaboration, users do not register
With one public section
: Registration, collaboration: many to many
User profiles, collaboration, users register
spam protection
Behind the firewall