.fay

WP Comments Moderators plugin allows any user (whatever their Role) to moderate any blog comment.
WordPress only allows users with Administrator|Editor role to moderate comments. Those two roles give much more than our need, if you are scared about your blog and dreamed about a lightweight solution, this plugin can be helpful for you.

WP Comments Moderators

WP Comments Moderators plugin allows any user (whatever their Role) to moderate any blog comment.

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.

WP Comments Moderators vs Virtual Moderator