Similar to the Social Network, you can also create a Members Networking Site. In this site, you get people to sign up as a member. As a member, they will enjoy certain privileges that non members cannot have. Usually for a social network, it is open for public to sign up. For Members Network, membership sign up will be by “Invitation” only. This allows you to control who sign up.
We can both create a Micro Site (within your existing organization website) and a Full Feature Site for you depending on your needs.