The Internet provides lots of ways of getting in touch, if you so desire. Personally, I like Twitter best. Feel free to follow me there, and send me an @ message if you’d like to respond to something on the blog.
There are alternatives, if you really hate Twitter, or if you’d like to send me a longer message in a non-public space. If you’re someone I know, you could add me on Facebook. I don’t update on Google+, but I don’t have any choice but to have one, so you could drop me a line there. Like the pictures I post occasionally? I’m on Flickr, too, and plan to use it more in future once I start shooting an SLR again. More of a business query than a personal chat? LinkedIn is good, too.
You could always be old-fashioned and send me an email, if you like. I respond to firstname.lastname@example.org as regularly as I can.
Alternatively, if you’re a gamer, I’m on Xbox Live as hachimaki, and PSN as hachihoshino.
Finally, if you’re Tokyo-based, you could always just suggest a time to go for a beer.