Maybe so, but what he's saying is consistent with the academic literature on social networks and social movements, some of which he cites. I know this literature very well and Gladwell's argument is consistent with the academic consensus that a lot of weak connections are good for spreading information and could promote low-cost activism, but you need strong ties in a dense clique to promote high-cost activism. For example:
- Centola, Damon and Michael Macy. 2007. “Complex Contagions and the Weakness of Long Ties.” American Journal of Sociology 113:702–734.
- Centola, Damon, Robb Willer, and Michael Macy. 2005. “The Emperor’s Dilemma: A Computational Model of Self-Enforcing Norms.” American Journal of Sociology 110:1009–1040.
- Granovetter, Mark S. 1973. “The Strength of Weak Ties.” American Journal of Sociology 78:1360-1380.
- McAdam, Doug. 1990. Freedom Summer. Oxford University Press.