Blogs do not meet Habermas' ideals but they are probably the closest thing to it. The barriers of use make the internet and blogging an activity that only a small number of socity can do. Within this small community there is a hierarchy and just because you can publish it doesn't mean it will be viewed. THe internet can encourage rational debate. However Habermas' ideals are fairly dated now, people would much rather see a picture of other peoples cats on MySpace or pictures of their last trip to europe on photobucket then discuss politics/news arts/culture and science technology.