This would be great for use inside our company, but only if it's on the Yammer model where everything is company-private. Don't want staff to have to go through

This would be great for use inside our company, but only if it's on the Yammer model where everything is company-private. Don't want staff to have to go through hundreds of external groups, just want them to see ours. If Convore is like IRC, what we need is a private IRC server. Is there any service like that? (Campfire ain't it)