Societies of mind in virtual reality
Assume that we do live in a virtual reality, as Nick Bostrom suggests:http://anhinga-anhinga.livejournal.com/8017.html
Also assume Marvin Minsky's theory that a person is a Society of Mind
Thinking about possible ways to implement a reality containing persons as societies of mind and assuming limited computational resources, it seems quite likely that the societies of mind of different people would share a lot of common mental processes, and that the overlap is higher between people, who interact a lot or share common history.
Among other things, this would shed some light onto mysterious instances of synchronicity -- interaction via shared subprocesses would be one of the possible reasons.