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Nathan Rice

StudioPress

By simply dragging this widget into your sidebar or any widgetized area, you can easily place icon links to your various social profiles like twitter, facebook, flickr, etc.

Social Profiles Widget

This plugin/widget allows you to insert icon links to your social profiles in any widgetized area.

Patryk Kachel

To use this plugin – your theme (or child theme) must support it. 
To display additional profiles for user you just need to use native WordPress function <code>the_author_meta( 'profile-name' )</code> where ‘profile name’ can be ‘twitter’, ‘facebook’, ‘googleplus’, ‘instagram’, ‘pinterest’.
Code example (with Font Awesome Icons):
<pre><code><?php
 $prefix_twitter_url = get_the_author_meta( 'twitter' );
 $prefix_facebook_url = get_the_author_meta( 'facebook' );
 $prefix_googleplus_url = get_the_author_meta( 'googleplus' );
 $prefix_instagram_url = get_the_author_meta( 'instagram' );
 $prefix_pinterest_url = get_the_author_meta( 'pinterest' );
?>
<?php if ( ! empty( $prefix_twitter_url ) ) : ?><a href="<?php the_author_meta( 'twitter' ) ?>"></a><?php endif; ?>
<?php if ( ! empty( $prefix_facebook_url ) ) : ?><a href="<?php the_author_meta( 'facebook' ) ?>"></a><?php endif; ?>
<?php if ( ! empty( $prefix_googleplus_url ) ) : ?><a href="<?php the_author_meta( 'googleplus' ) ?>"></a><?php endif; ?>
<?php if ( ! empty( $prefix_instagram_url ) ) : ?><a href="<?php the_author_meta( 'instagram' ) ?>"></a><?php endif; ?>
<?php if ( ! empty( $prefix_pinterest_url ) ) : ?><a href="<?php the_author_meta( 'pinterest' ) ?>"></a><?php endif; ?>
</code></pre>
You can see it in action here: https://pencil1.blogonyourown.com/author/robertsummer/

User Social Profiles

Plugin adds social fields to user profile in admin panel (Dashboard > Users).

Social Profiles Widget vs User Social Profiles