Post content to specific user

I have a need to occasionally post user specific information. My need is to be able to only have posts available to specific users when they are logged in. I need to provide feedback to individuals, and I would like to use the blog as a vehicle to do so. For example:

when John Doe logs in, he sees all public posts, however, he also needs access to a page that will only show posts that I give him permission to view. Whether this is a separate page or integrated into the home page doesnt matter.

Likewise, Dave Smith logs in, and sees all public posts, however he can only see posts assigned to him. He cannot see John Doe’s personal posts.

Are there any plugins that will let me achieve this? Ideally I’m looking for something I can trigger by writing a post, then check the user(s) who are allowed to view it, then publish. Similar to the group levels, just at the user level.