Most social network platforms we set-up and run are for business organizations. Organizations that want to connect people, ideas and information - mashups - so they can improve decision making and performance amongst employees, customers, suppliers, etc. But some of the ideas Mr. Young writes about, scaling self-expression, reach of distribution, and decentralizing the ecosystem apply to what we enable inside businesses.
Here's a podcast for anybody wanting to understand the basics of developing an on-line community or social networking or web 2.0 application. Covers both technical, rss and tagging, and the social aspects, trust and participation.
From Knowledge at Wharton, Podcast: What Makes an Online Community Tick? Ask Craigslist, Yahoo and Pheedo. (registration required)