My idea was that you should manage your own data, and have them tagged with the rights to broadcast or syndicate.

The gist of it would be:

If I write something as a tweet, wordpress would be the first to pick it up and possibly manage it. WP would be more of a CMS for your data. Write a tweet, it can be shown on your blog, and possibly to twitter and/or facebook. This would work for other content types. The value of twitter and fb is the network affect and curration.

I've recently become niggled by a very similar idea of a personal data store with a layer for managing rights of broadcast and syndication.

A simple example is that I would want any food delivery app, or web-connected restaurant to know my dietary data instantly, but not really much else. Any new-media site I connect to I want to instantly know what kind of content I find boring or distracting, but not really anything else.