After I got @Emmanuel_Chanel, an account of Twitter, I’ve got a bit interested in social bookmark buttons. So I put the buttons with WP-Social-Bookmarking-Light, a plugin for social bookmarks, found by Google. That plugin has also the buttons of mixi and of grow! but I haven’t since I don’t have their API keys.
I don’t know how many new visitors it would make by that since my text of the blogs aren’t very good.