TyCam

This plugin is extremely beneficial if you have more than one author on your blog but it?s also still good to have even if your blog only has one author. What it does is add in social media links to your Contact Info section in your user profile for popular social media sites such as Google Plus, Twitter and Facebook.
Once you fill in one or more of those fields, 16 x16 icons will appear next to your name when your name appears as the author of a blog post. This lets readers easily find your social media information as they read and is completely unique to each author.

Author Social Links

Adds 16x16 social media icon links next to the author's name, unique to each author.

Dennis Ploetner

Just another widget to show a photo, a bio and some social media links with nice webfont-icons
The plugin is using the JustVector Social Icons Font created by <a href="http://www.alexpeattie.com/projects/justvector_font/" rel="nofollow ugc">Alex Peattie</a>.

WP-Whoami

Just another widget to show a photo, a bio and some social media links with nice webfont-icons

Author Social Links vs WP-Whoami