I agree with Steve’s basic assumption that people are looking to interact in a more seamless manner. It is my opinion that the content format and exact methods are becoming irrelevant. People are looking to platforms (I use that term in a general since), that deliver valuable experiences of all types in a way that is seamless from their vantage point.
I’m interested in what Steve Rubel has undertaken and will watch as it develops. In fact, I believe that his ‘lifestream’ concept benefits so much from Posterous that I my self am looking at how to leverage their mechanism to help craft my contribution to this people-driven transformation.