Specialized networks have two paths. One is offer value even if you are the only user. Instagram and Pinterest do this. The other is making sure people join in

Specialized networks have two paths. One is offer value even if you are the only user. Instagram and Pinterest do this. The other is making sure people join in groups, which is close to what Yammer does. (There is the dark path of spamming your users' contacts from another network, but we know where it leads.)