I really wonder if it is ever one thing, rather than an assemblage of parts. This has me thinking about blogging as well and how the take up of Twitter might compare with the early days of educational blogging? Would there be similarities? Do these things change? Would someone starting out on their path now be different to yourself starting out in 2009? How does it differ from a wider discussion of connected education? Always so many questions.
Ian, your post (and visual) raised many questions. I think my own experience of Twitter was somewhat multi-pronged. There was quite a bit of inadvertent nudging, during a course on thinking, while I also had a few friends on it. I have documented a part of my story here, as well as created a short video documenting it: