That is why we invented this: http://www.faqs.org/bs/ad.iphone.php?r=%2Fpatents%2Fapp%2F20...
Bitcoin has solved distributed money. But distributed social networking is still a hard problem to solve. That's why people take what they can get. They host their own blogs with Wordpress, the web is distributed, but social networks are all centralized silos!
But soon that will change. When http://platform.qbix.com hits 2.0 :)