Instead of the "walled garden", make every person have the ability to program a node, and then have specialized websites where they could find other people in a

Instead of the "walled garden", make every person have the ability to program a node, and then have specialized websites where they could find other people in a category and connect their notes to other peoples (by exchanging some sort of key). This would allow for a facebook-site to establish itself, but the existance of a "personal node" that was decentralized would allow you to cut ties with a particular site if you wanted to, and it would give you the ability to move towards greener pastures if you didn't like what the existing site was doing.