WP JV Post Reading Groups
Easily create posts and pages visible only for selected users of your blog
This plugin will enable you to
Create Reading Groups and associate them with users and private posts and private pages
Once these users logged in they will see those private posts and private pages which you granted access to
Publish your posts and pages to general public as usual
Your users will not be aware (unless you tell them) of what Reading Groups they are part of (if any).