Both writings raise interesting dimensions –
The last pillar “Scale kills conversation, so Protect Conversations From Scale” is very relevant (and very difficult !)
“Finding way for people to self-organize, split up and reform dynamically, and form affinities with groups ” is congruent to the graph primitives in ad-hoc networks, one of my passions !
When a social network group scales in a scale-free manner, one would like it to morph into sub-graphs (to keep the conversation, one really cannot shout to 10,000 folks and manage the threads ;o(), still maintaining the connectivity thru sentinel nodes and thus keeping the “bigger” network alive.
Each network has it’s own form, function and utility (Book  below explain the dimensions of organization very well), so we cannot arbitrarily create sub-groups and forget about the original organization.
Couple of good books for summer reading (in addition to The Deathly Hallows, of course ;o))
1. Everything Is Miscellaneous: The Power of the New Digital Disorder
2. Watch This, Listen Up, Click Here: Inside the 300 Billion Dollar Business Behind the Media You Constantly Consume
3. The Black Swan: The Impact of the Highly Improbable
4. Herd: How to Change Mass Behaviour by Harnessing Our True Nature