Prasanna SP

Just like the normal WordPress site feed, wordpress categories and tags also has feeds. The category feed is located at <code>site.url/category/categoryname/feed</code>. This plugin automatically adds the RSS feed link to the current post categories after the post content. By default the plugin shows category feed link on single posts. You can change it’s settings to show it on other pages, such as archives as well. You can change it’s title in WP-Admin –> Settings –> Follow Category Feeds.
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Follow WordPress Category Feeds

This plugin adds link for the category feeds after post content.

Marco Buttarini

Plugin that add widgets to add twitter follow button to your website. Multiple widget with different configurations.

Twitter Follow Button Widget

Add multiple widget with twitter follow button.

Follow WordPress Category Feeds vs Twitter Follow Button Widget