Dave Winer has been developing applications that support users owning their own data. His latest is a blog page rendering system he calls MyWord.io.
This is an example of what I've been calling a person cloud application architecture (PCAA). The key idea is to separate the application from the data and allow the data to be hosted anywhere the owner chooses. The advantage is that there's no central server intermediating the interaction.
Dave's on a roll here. I wrote about his nodeStorage project a few week ago. I'm heartened that developers like Dave are building applications that support people being in control of their own data rather than having to surrender it to the database of some company and be forced to interact with it through the company's administrative identity.