Ning

With Ning you can create your own social network specifically geared towards a topic or community. You don’t have to be a developer to start building with Ning, their drag-and-drop network builder empowers you to easily create a professional website and social network in a matter of minutes. You can also customize your network with HTML and CSS and make it your own. Through solid integrations with Twitter, Facebook, LinkedIn and Google, user registrations becomes as simple as clicking a button. To-date, Ning has been used by over 2 million people and organizations to create immersive social networks and communities.