The writer (Sangeet Paul Choudary) doesn't mention Clay Shirky but as far as I can tell, Clay has written the most essays about web communities and scaling problems:

http://shirky.com/writings/community_scale.html

http://www.shirky.com/writings/herecomeseverybody/herecomese...

https://www.amazon.com/Here-Comes-Everybody-Organizing-Organ...