Taylor Marek

Customize what kind and where your ‘Call To Action’ box should be located.
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Forget trying to attract an audience through interruption-based marketing (popups, slide-ins, bars, random text, etc.). It doesn’t work. Visitors would sooner leave than be bombarded by those kind of ads.
This plugin is what you’ve been searching for and features everything you need to customize to your taste.
At its core, this plugin was designed to flow with your blog theme and provide your audience with a ‘call to action’ when they get to the end of your blog post. Obviously, you want them to “do something” after they have read your post, right?
Be sure to follow <a href="http://twitter.com/taylormarek" rel="nofollow ugc">Taylor Marek</a> on Twitter if you need support!

Call To Action Plugin

Easily add a Call To Action Box to your WordPress blog!

snowbedding

Adds an author box after your post contents, with Gravatar and social profile links. 
* More than 10 Social Profile supported 
* Set custom avartar image instead of registering Gravartar account. 
* Compatible with [WordPress SEO by Yoast] plugin. 
* WordPress 3.9 Ready!

Author Box After Posts

Adds an author box after your post contents, with Gravatar and social profile links.

Call To Action Plugin vs Author Box After Posts