This web site attempts to track, among other things, technology as a mechanism for collective consciousness. My book surveyed other mechanisms identified in the ongoing investigation of the nature of consciousness, and here’s an older paper I missed in that vein.

“Evidences are presented that electromagnetic potential fields mediate the collective field of consciousness. This result offers for the first time experimental access to the study of collective consciousness by measuring the field-related information-carrying potentials and their derivatives, the electric and magnetic fields between different individuals.”

http://www.meta-religion.com/Physics/Consciousness/physics_of_collective_consciousness.htm