It might work for a blog when it is big like Dannychoo.com which Rukinet. is not. Yet. However, you can always use the comments section below any post to do pretty much the same thing you would do in a forum, albeit slightly simplified.
I do have a community site project that I am currently working on, but it will be in Swedish. I may do something else like it in English in the future, but it won't be about what the Swedish site nor Rukinet. is about, because three sites about the same thing will get tedious and boring (for me).