Alternatively, it's a nifty way of keeping in touch with friends, family and colleagues. Perhaps in education, students, tutors and peer-groups can post updates quickly and easily by text message as they work collaboratively on projects and courses. Listen to/watch the inventor in the video below giving a really interesting presentation about social networking media, including an historical overview.
You decide which it is. Meanwhile, I'm available on my own personal Jaiku channel as per the link on the right hand side of this blog!
p.s. thanks, Ina for the info.