MarkTroll is a simple WordPress plugin that implements user <a href="http://en.wikipedia.org/wiki/Hellbanning" rel="nofollow ugc">shadowbanning</a> (or hellbanning) for comments.
Comments by shadowbanned users will be invisible to all other users. However, the shadowbanned users will continue to see their own comments, hopefully oblivious to the fact that they’ve been shadowbanned. This is non-destructive in that changes are not made to the comments themselves. Shadowbanned comments are still saved to the database and visible to admins in the dashboard comments listing. Note that contrary to other plugins, Marktroll does not expect the commenting user to be logged to be shadowbanned.
If you disable this plugin, showbanned comments will become visible to all users.
Licensing
All code is released under The GNU License. Please see LICENSE.txt.

MarkTroll

MarkTroll is a WordPress plugin that will let you shadowban (hellban) any unlogged (regular) commenter on your blog.

Another Cup of Coffee Limited

FeenBan is a simple WordPress plugin that implements user <a href="http://en.wikipedia.org/wiki/Hellbanning" rel="nofollow ugc">shadowbanning</a> (or hellbanning) for comments.
Comments by shadowbanned users will be invisible to all other users. However, the shadowbanned users will continue to see their own comments, hopefully oblivious to the fact that they’ve been shadowbanned. This is non-destructive in that changes are not made to the comments themselves. Shadowbanned comments are still saved to the database and visible to admins in the dashboard comments listing. All that happens is that a ‘shadowban’ flag is set in the user metadata.
If you disable this plugin, showbanned comments will become visible to all users.
For the latest instructions and more information, please see the <a href="http://anothercoffee.net/feenban/" rel="nofollow ugc">Plugin Homepage</a>
Licensing
All code is released under The MIT License (also known as the “Expat License” by the Free Software Foundation). Please see LICENSE.txt.
Although this plugin has been released under a license compatible with the GPL2 as stipulated by the <a href="https://codex.wordpress.org/Writing_a_Plugin#File_Headers" rel="nofollow ugc">WordPress guidelines</a>, users are encouraged to checkout the BipCot NoGov license from the Beastlick Internet Policy Commission Outreach Team: http://bipcot.org

FeenBan

FeenBan is a WordPress plugin for shadowbanning / hellbanning commenters.

MarkTroll vs FeenBan