How can I give users the opportunity to make few posts completely private (i.e. visible only to themselves)? I'd like to do this with a make this post private - only for me checkbox.
This module allows you to manage permissions for content types by role and author. It allows you to specifiy custom view, edit and delete permissions for each content type. Optionally you can enable per content access settings, so you can customize the access for each content node.
Or you can do by allow permission to allow specific viewer/role