Abhinav Singh

WordPress Toolbar (supports WPMU since v 2.2) is a unique plugin which automatically enables a toolbar for all outgoing links from your blog post, similar to stumbleupon or facebook toolbar. You can customize the widgets that will show up on the toolbar using the admin panel.
Once the plugin is enabled, whenever someone clicks on an outbound link from your blog post or page, it will open with wordpress toolbar at the top. By default wordpress toolbar shows following widgets on the toolbar (all widgets can be enabled/disabled from admin panel):
<ol>
<li>Link back to your blog home</li>
<li>Link back to your blog post/page from where user came to this toolbar</li>
<li>A list of social share icons (defaults to twitter,facebook,stumbleupon,…) using which the user can share your blog post/page</li>
<li>Comment back link to the referrer blog post</li>
<li>Get this plugin link which by default points to https://wordpress.org/extend/plugins/wordpress-toolbar/</li>
<li>Leave toolbar (shown as a cross button), using which user can leave this toolbar</li>
</ol>
Since v 2.1, WordPress toolbar also provide following features:
<ol>
<li>Sociable Share Icons (Disabled by default): If enabled plugin will display social share icons at end of each blog post/page</li>
<li>TinyURL Share Link (Disabled by default): If enabled plugin will display a tinyurl at end of each blog post/page.</li>
</ol>

WordPress Toolbar

WordPress Toolbar (supports WPMU since v 2.2) is a unique plugin which automatically enables a toolbar for all outgoing links from your blog post, sim …

Scott Kingsley Clark

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you’d like.
This plugin supports both Per-Site and Per-Network (WordPress Multisite) settings, so you can fine tune your options based on your needs.
Other plugins you might be interested in:
<ul>
<li>Showing the Admin Bar in more cases – <a href="https://wordpress.org/plugins/always-show-admin-bar/" rel="ugc">Always Show Admin Bar plugin</a></li>
<li>Showing the Admin Bar to logged out users – <a href="https://wordpress.org/plugins/logged-out-admin-bar/" rel="ugc">Logged Out Admin Bar plugin</a></li>
<li>Customizing the Admin area based on role – <a href="https://wordpress.org/plugins/adminimize/" rel="ugc">Adminimize</a></li>
</ul>

Admin Bar Disabler

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you'd like.

WordPress Toolbar vs Admin Bar Disabler