People aren't looking for a replacement for email... excuuuse me? Explain Twitter, then. Explain IM. Explain Wikis and CMSes and pervasive webmail. Explain Face

People aren't looking for a replacement for email... excuuuse me? Explain Twitter, then. Explain IM. Explain Wikis and CMSes and pervasive webmail. Explain Facebook. Collaboration as a space is hugely under-colonized and the existing colonies are small, sickly and vulnerable. They don't reinforce one another. Also: if people can learn to drive a mess like Facebook, they can learn Wave, and in the same way: by getting pulled in by their friends, and following the affordances.