leanderlindahl

This plugin will create an authorbox widget that you can place in a sidebar. The widget displays the users gravatar, biographical info and icons linking to Facebook, Twitter, LinkedIn and Google Plus.
Edit the users profile page and provide the necessary information. The social media links should be full URL:s, i e 
http://www.facebook.com/joe-smith 
http://www.twitter.com/joe-smith

Social Author Box

Creates an "Author Box" Widget with the author's picture, bio and social media links.

arifnezami

Simply adds an author bio box in every post automatically. You can choose where you want to show it. You can add links of your Blog, Twitter, Google+, LinkedIn and Facebook profiles on the bio. Do it automatically or manual with shortcode [author_bio] or .

Better Author Bio

Simply adds a author bio in every post automatically.

Social Author Box vs Better Author Bio