I need to read the Synovate report for myself, and I will look at the next results from Forrester's surveys of Japanese consumers to see if I see the same thing... Can't do that right now, I'm afraid.
I think Jeff is spot on with his view that Japanese Social Computing is often Web1.0 at heart. In particular, I agree with his observation that anonymity and lack of segmentation (trying to cater for the "general population") hold back the possibilities for Social Computing.
Could Japan's fickle consumers decide that SNS was just another fad and "move on"?
Somehow I cannot imagine it. (Move on to what? Long socks and tiramisu?). Is it possible to have a "camel" shaped adoption curve...?