This is a test of a private post. It should be visible on but not on or

The idea here is that I can use a single blog to blog general public stuff, but if I tag something in a @private category (or actually any category starting with @) it will only be visible on domains that contain the string of letters of the category in their name. For instance, @private posts will only be visible at, and @onethingido posts would only be visible anywhere on the domain.