Scott Reilly

This plugin adds a checkbox to the profile page for users which allows them to opt into receiving a notification email whenever a comment is made to the site.
If a comment goes into moderation, only users who have the ability to manage comments on the site will receive the moderation notification email.
By default, all users of the site have the ability to subscribe to notifications about comments. A filter is provided to facilitate use of code to customize the feature’s availability to users.
Note: a “user” is a person with an actual login account for the site. The plugin does not facilitate permitting visitors who do not have an account on the site to be able to subscribe to all comments.
Links: <a href="http://coffee2code.com/wp-plugins/optin-comment-notifications/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/optin-comment-notifications/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/optin-comment-notifications/" rel="nofollow ugc">GitHub</a> | <a href="http://coffee2code.com" rel="nofollow ugc">Author Homepage</a>

Optin Comment Notifications

Checkboxes on user profiles to receive emails about new comments. Like it says.

Exactly what you want

Allows users to opt into receiving a notification email whenever a comment is made to the site.

mhawksey

<a href="http://www.rsc-ne-scotland.org.uk/mashe/utitle/" rel="nofollow ugc">uTitle</a> is an experimental tool which uses Twitter to allow users to make free and timeline based comments on YouTube videos. The original concept is <a href="http://www.rsc-ne-scotland.org.uk/mashe/2010/06/convergence-youtube-meets-twitter-in-timeline-commenting-of-youtube-videos-using-twitter-utitle/" rel="nofollow ugc">explained in detail in this blog post</a>, but the basic idea is video are played in custom interface which lets users ‘tweet’ comments. Part of each tweet includes a hashtag linking it to a specific YouTube video and a timestamp from the current point in the video. Tweets are stored in the <a href="http://twapperkeeper.com/" rel="nofollow ugc">TwapperKeepr</a> and temporarily cached on the uTitle site. When a video is replayed in the uTitle interface existing comments appear at the timed points as subtitles and users can also use the timed tweets to jump to part of the video <a href="http://www.youtube.com/watch?v=RVp2F6tDWfw" rel="nofollow ugc">(see this video for a demonstration)</a>
This plugin allows you to easily embed commented YouTube videos by enabling a uTitle specific short code (e.g. [utitle mode=1 comment=yes]RVp2F6tDWfw[/utitle]). Options are available to choose the type of player (see Screenshots) and as well as a choice to provide a link to invite users to add their own comments.
uTitle essentially works as the glue combining YouTube and Twitter, subsequently there is no direct control over moderating comments (but it does via TwapperKeepers configuration conform to Twitter’s deletion policy).
This plugin and the uTitle site are not affiliated with YouTube or Twitter.

uTitle Plugin

The uTitle Plugin  allows timeline commenting of YouTube videos using Twitter by integrating with the experimental uTitle tool

Optin Comment Notifications vs uTitle Plugin