Ederson Peka

This plugin adds a checkbox to the default comment form, allowing the commenter to restrict his comment’s exhibition only to site owners.

Private Comment

Allow commenters to choose restrict their comments exhibition only to site owners

richieri

When you write a new Post or Page (or maybe a Custom Post Type) this plugin make Private Visibility choosen by default.
Active it and it’s done.
<h4>Important URL’s</h4>
<a href="http://www.richieri.com/" rel="nofollow ugc">Author’s Blog</a>
<a href="http://www.richieri.com/private-post-by-default/" rel="nofollow ugc">Plugin Home</a> | 
<a href="http://www.richieri.com/private-post-by-default/" rel="nofollow ugc">Forum</a> | 
<a href="http://twitter.com/richieri" rel="nofollow ugc">Twitter</a>

Private Posts by Default

When you write a new Post or Page (or maybe a Custom Post Type) this plugin make Private Visibility choosen by default.

Private Comment vs Private Posts by Default