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Comments Subscriber is a WordPress plugin that simply adds a subscription checkbox to your WordPress comments form to let your visitors subscribe to comments. 
They will then be notified by email when others comment on the same post. Works automatically upon activation, no settings required.
<h3>Licence</h3>
Comments Subscriber is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Comments Subscriber. 
If not, see https://www.gnu.org/licenses/gpl-3.0.html.
<h3>Support</h3>
If you need support or have a feature request, please use the <a href="https://wordpress.org/support/plugin/comments-subscriber/" rel="ugc">support forum</a>.

Comments Subscriber

Set up a subscription checkbox to receive an email every time someone comments on the same post.

Karl-Heinz Klug

Get more Twitter Followers with this Plugin! Bibs Twitter Follow Button Reloaded adds the official Twitter Follow Button with a Widget to your WordPress Blog to increase your readers engagement and create a connection with your Blog Readers. You can use as many widgets you want, all with different settings.
Or as an alternative you can Shortcodes like [tfb username=’yourusername’ count=’true’ lang=’en’ theme=’light’] for light blue color or [tfb username=’yourusername’ count=’true’ lang=’en’ theme=’dark’] for dark color. You can even mix widgets an Shortcodes.
The Widget offers more options than the Shortcode. You can use padding for better placement inside the widget and your own CSS for a border around the Button as example.
The Plugin works also with WP Multisite.
The Plugin is available in English and German!
This Plugin is based on <a href="https://wordpress.org/extend/plugins/twitter-follow-button-shortcode/" rel="ugc">Twitter Follow Button Shortcode and Widget</a> by Muneeb ur Rehman and <a href="https://wordpress.org/extend/plugins/tf-button/" rel="ugc">TF Button</a> by Jan Heuninck and is modified by B. Hoffmann & K. H. Klug.
Find more infos about Bibs Twitter Follow Button Reloaded and free WordPress Themes at <a href="http://wp-ezine.com/wp-plugin-bibs-twitter-follow-button-reloaded_132950.html" rel="nofollow ugc">WP Ezine</a>

Bibs Twitter Follow Button Reloaded

Get the official Twitter Follow Button as a Widget or Shortcode for your website.

Comments Subscriber vs Bibs Twitter Follow Button Reloaded