If there enterprise edition of build-it yourself social networking site, this is it. It appears more geared towards professional/business type sites, rather than artsy ones.

Oldest, biggest, but with the least advanced features. Let's you do most of the usual functions of social networks. People can create their own profiles, let people add videos, photos, forums, blogs, RSS readers, and embedded widgets. Let's you change the HTML and CSS to give it a more personalized look. But there's no sophisticated multi-author control as in goingon.com or the cutting-edge look of Wamily.

If you want a social-network of your own with super techie feel and look, this is it. All the modules on your customizable profile, or the social network you create appear on into windows that can float on the page, be changed in size, etc. on the fly - that is without reloading the page. Check it out and you'll be impressed.