Kamal Hosen

pixelplugin

This plugin will easily give the user the option to follow the category or tag of his choice. This is basically a widget based plugin, it will work from the time you activate your tag / category follow widget after you install the plugin. One of the conditions for this to work is that the user must be logged in.

Follow Tags & Categories

User's can follow specific Tags or category and show only those tags/category posts.

zackproser

The Simple Twitter Follow Me button allows you to add a small or large Twitter follow button to the end of every post so you can grow your Twitter following with your blog readers and let your audience easily share your content on social networks.
Once installed and activated, go to Settings -> Reading and scroll down to the Simple Twitter Follow Button settings.
Here you can enter your Twitter username and choose whether the button should be small or large.

Simple Twitter Follow Me Button

This plugin is the easiest way to add an official Twitter follow button at the end of every post so your readers can follow you on Twitter.

Follow Tags & Categories vs Simple Twitter Follow Me Button