Riyaz

WP Tweetbox adds a manual tweetbox with Twitter-style editor at the end of posts and pages.
Features:
<ul>
<li>Tweets branded to your website</li>
<li>Fully Customizable Tweetbox</li>
<li>Tweet text can be auto-generated</li>
<li>You can specify a custom Tweet text for individual posts/pages</li>
<li>Tweetbox can be disabled on individual posts/pages</li>
<li>Supports Su.pr, Bit.ly, Bitly.pro, Wp.me URL shorteners</li>
<li>You can use a WordPress short URL with post ID or long permalink URL as well</li>
</ul>

WP Tweetbox

WP Tweetbox adds a highly customizable Tweetbox at the end of blog posts and pages. Tweets are branded with your own website URL.

GetSocial adds a lightweight and intelligent floating social media sharing box on your blog posts.
Features:
<ul>
<li>Floating social share box compatible with leading web browsers</li>
<li>Out-of-the-box functionality like
<ul>
<li>Twitter Tweet Button</li>
<li>Facebook Like and Share button</li>
<li>Google +1 Button</li>
<li>Buffer Button</li>
<li>Pinterest Button</li>
<li>LinkedIn Button</li>
<li>Stumbleupon Submit button</li>
<li>CentUp button</li>
<li>Your Own Button</li>
</ul>
</li>
<li>Easily add any number of additional social media sharing buttons</li>
<li>Re-order buttons with simple drag-and-drop</li>
<li>Hide individual share counts if desired</li>
<li>Resize GetSocial share bar width (useful for non-English blogs)</li>
<li>Always visible and accessible even if the user scrolls down the page</li>
<li>Auto-adjusts itself to all screen resolutions and window sizes</li>
<li>Automatically hides itself partially to the left of the screen if window is resized to smaller than defined width</li>
<li>Completely hides itself on tablets and mobile screens</li>
<li>Hovering over a partially hidden GetSocial box displays the full box</li>
<li>For higher screen resolutions, displays full by default</li>
<li>Easy-to-use Color Picker to customize the look and feel to match your blog theme</li>
<li>Lightweight plugin with minimal settings</li>
<li>Scripts are loaded in footer to improve page-load time</li>
</ul>
Be sure to check out: <a href="https://wordpress.org/extend/plugins/social-metrics/" title="Social Metrics Plugin" rel="ugc">Social Metrics</a> – Helps you track how your posts are shared in the social media.

GetSocial

GetSocial adds an intelligent, lightweight, quick to setup floating social media sharing box on your blog posts.

WP Tweetbox vs GetSocial