OK, I see the advantages of using a wiki to collaborate with people. Quite frankly, though, nobody in my Luddite circle has invited me. We’re all still using e-mails (which, as the Common Craft video points out, can be an inefficient way to communicate).
In neither my professional life (office/work/school/library) nor in my personal life (community organizations/family) are people using wikis. Once I did take a course where we all posted our projects to a class wiki, but we never edited them or worked together to produce anything.
It’s unusual for me to simultaneously feel behind the times – because the truly hip people are already using wikis – and ahead of all my own contacts - because I would know how to create and edit a wiki if others were willing to participate.