Marc Tönsing

lefalque

Adds a link next to the reply link below each comment, which allows visitors to flag comments as inappropriate. 
A sub page to comments in admin is added, where an administrator may review all the flagged comments and decide 
if they should be removed or not.
Admins or logged-in users with comment moderation permissions are able trash or replace comments with 
one click in the frontend. This action can not be undone. A “trash” link will appear bellow all comments. 
Don’t worry: You can untrash them if until you reload. You are also able to replace the comment text with a custom 
text which can be set in the settings.
<h4>Features</h4>
<ul>
<li>Ability for visitors to report comments they find offensive.</li>
<li>Once a flagged comment has been deemed ok, it wont be able to be flagged again.</li>
<li>Flagging is done via ajax for smoother experience for the visitors.</li>
<li>Decide whether all visitors or only logged in users can report comments.</li>
<li>Trashing and Replacing with ajax in the frontend for faster moderation.</li>
<li>Fully localized. Comes with English and German translations.</li>
</ul>

MarcTV Moderate Comments

Grants visitors the ability to report inappropriate comments and admins to replace and trash them in the frontend.

Adnan Haque (a11n)

Time for moderators and blog monitors to take rest. Let the visitor choose what they want to see in the blog. Visitor can flag unsuitable posts. After a number of flags the post status will be changed to anything you want. You can change the post status to Draft, Pending Moderation, Moderated(custom status) or send the post to trash, remove it permanently. You can also set it to do nothing if you plan something else. You can have a notification if the post is flagged number of times you will have set.
You can exclude some categories and mark some users as safe to remove the flag option from there posts.
You can track visitors by IP, Cookies and user id to prevent multiple flags. You can chose who can flag by user roles.
The plugin is css frienfly. You will be able to customize the posts by the number of time they have flagged.
More details on the documentation page after installing the plugin.

Virtual Moderator

This plugin helps to keep community blogs clean. There must be some unwanted posts if blog is open for anyone. It Lets visitors to flag those posts.

MarcTV Moderate Comments vs Virtual Moderator