
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.
The customizable profiles are more customizable than most, you can add and remove modules, that includes external blogs, your videos/photos, connections, your recent comments on blog items on the site, links to other sites, your links on del.icio.us, and on and on. It provides the infi-customizable profile.
Yet what is the most powerful characteristic of goingon.com is that it allows advanced multi-author blogging. Each author can independently write blogs, and this content can be featured or stored only associated with that particular writer. To see a network that uses most of these features to perfection, see alwayson.goingon.com.
The system is free to use for up to 10 authors, and it's $19.95 to have unlimited authors. There's also other options for controlling ads on your site.