This is a hard point to grasp, but it provides a substantial amount of leverage for small groups. It's important to manufacture copies of yourself that can advance your goals whenever possible. In short:
...self-replicate...
This can take a direct physical form in the case of technological copies -- this includes everything from software bots (which can reach millions of "hacked" computers) and genetically engineered contagion. These technological copies will only get smarter and more responsive as technology improves.
Another method is to create socially engineered copies of your organization through the use of social media. Basically, this means providing the motivation, knowledge, and focus necessary for an unknown person (external and totally unconnected to your group) to conduct operations that advance your group's specific goals (or the general goals of the open source insurgency). All forms of self-replication will rapidly improve with advances in technology and connectivity.