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.

Matthias Pfefferle

julien51

This widget adds a <a href="http://www.subtome.com/" rel="nofollow ugc">SubToMe</a> button to your WordPress blog. This button allows your readers to follow your blog using their favorite applications.
If the user clicks the button, then, it will load an external iframe with JavaScript. The iframe will show the user the list of their favorite subscription tools. Once they pick one, they’re redirect to it with your blog information.
The user information is stored in the browser, but is only accessible on the domain <code>subtome.com</code>, which is why we have to load the iframe.
No data is ever “leaked”. The whole <a href="https://github.com/superfeedr/subtome" rel="nofollow ugc">SubToMe code</a> is open source. Feel free to check it out by yourself.
<h3>Credits</h3>
<a href="https://github.com/tommcfarlin/WordPress-Widget-Boilerplate" rel="nofollow ugc">WordPress Widget Boilerplate</a>, <a href="http://notizblog.org/" rel="nofollow ugc">Matthias Pfefferle</a> for his precious help, mostly with version 1.3!

SubToMe

This widget adds a SubToMe button to your blog and allows people to subscribe to your content in one click.

Simple Twitter Follow Me Button vs SubToMe