This is the Vikinghammer Tweet plugin.
You can set it up to post tweets based on new posts or comments to your blog. This requires that you enter your Twitter credentials.

Vikinghammer Tweet

Send a tweet for any new post or comment to your blog.

a.ankit

This plugin allows administrators to disable comments on specific post categories.
This is a very basic plugin developed for a particular use case. If you have any feature suggestions then pls use the forums.
If you face any problem using the plugin please ask in the <a href="https://wordpress.org/support/plugin/disable-comments-on-post-categories/" rel="ugc">Forums</a>.
Here is the link to <a href="http://spoontalk.com/wordpress/documentation-for-disable-comments-on-post-categories-plugin/" rel="nofollow ugc">Documentation</a>.
<h3>Is it Multisite Compatible?</h3>
NO, Not yet. However if enough users request it, I might add it at a later stage.

Disable Comments on Post Categories

As the name suggest, the plugin allows administrator to disable comments on specific post categories.

Vikinghammer Tweet vs Disable Comments on Post Categories