Adding aspects of social networking to application -- 2

We have launched a website where we are looking to add aspects of social networking. The first aspect we are looking to add is messaging, however we may want to add a host of social networking capabilities, such as group formation, message blocking, lead sharing and partner sharing. We are not looking to create a new app but to use a white label provider or social engine. Please let us know what white label provider you are familiar with such as Honeycomb, vendasta, livechat, social pilot, codera or others. Or if you know social engine or something similar.