CommentPress Core allows fine-grained commenting in the margins of a text. Use it to annotate, workshop or debate a social text in a social context.
Subscribe to Comments Reloaded allows commenters to sign up for e-mail notifications of subsequent replies.
Realtime forums and commenting for WordPress.
Unsubscribing from comment notifications is not quick and easy enough in Subscribe to Comments Reloaded. This addon plugin fixes that.
The Facebook Comments WordPress plugin makes it easier for you to setup, administer and customise Facebook comments from your WordPress site.
Add moment-by-moment social commenting to your embedded videos.
Get email notifications when Facebook Comments are posted on your WordPress website.
The simplest way to turn your standard WordPress website with a standard WordPress theme into a Social Network.
The Google+ Comments WordPress plugin makes it easier for you to setup, administer and customise Google+ comments from your WordPress site.
Replace the WordPress Comments Template with the PlusOne Commentbox
The Re-vu comment system replaces your WordPress comment system with your comments hosted and powered by Re-vu.
Ultra Lite Weight Plug & Play WordPress Plugin for Facebook Comments - Email Notification.
The Live Video Annotation plugin allows you to add timed footnotes to a YouTube video. Visitors can see these notes later while watching the video.
Easily subscribe to a P2 comment thread without commenting using a "Follow" action link like WordPress.com has
Facebook Comments is a social plugin that enables facebook user commenting on your site. Features include moderation tools and distribution.
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