itthinx

The Lazy Widget Loader plugin provides lazy loading for widgets to improve page loading. 
Use it on slow widgets, especially those where external data is loaded, like widgets from Facebook, Twitter, AdSense, …
What this plugin basically does is to postpone loading the content of those widgets you choose, so that their content is loaded after the main content of the page that is displayed.
You can choose which widgets should be loaded like that, by default the plugin does not “impose” itself on any widget. You may also choose to display a throbber while the content of a widget is loaded.
Feedback is welcome! 
If you need help, have problems, want to leave feedback or want to provide constructive criticism, please do so here at the <a href="http://www.itthinx.com/plugins/lazy-widget-loader" rel="nofollow ugc">Lazy Widget Loader plugin page</a>.
Please try to solve problems there before you rate this plugin or say it doesn’t work.
A lot of work goes into providing you with free quality plugins! Please appreciate that and help with your feedback. Thanks!
<a href="http://twitter.com/itthinx" rel="nofollow ugc">Follow me on Twitter</a> for updates on this and other plugins.
Translations
<ul>
<li>Lithuanian translation provided by Vincent G from <a href="http://www.Host1Free.com" rel="nofollow ugc">Host1Free</a> – Thanks for your help!</li>
</ul>
<h4>Advanced lazy loading integration</h4>
The Lazy Widget Loader can take advantage of the advanced asynchronous loading mechanism provided by the <a href="http://www.itthinx.com/plugins/itthinx-lazyloader" rel="nofollow ugc">Itthinx LazyLoader</a> for content and widgets. 
This plugin helps to optimize site speed by greatly improving page load time and bandwidth usage. 
Instead of deferred loading in the footer, it provides advanced options that allow to load any content only when needed. 
These include shortcodes that allow to lazy-load content anywhere on a page, the option to load content on sight and an automatic noscript feature that helps to provide alternative content for visitors that have disabled JavaScript. 
You can see a <a href="http://www.itthinx.com/plugins/itthinx-lazyloader-demo" rel="nofollow ugc">demo of the Itthinx LazyLoader here</a>.

Lazy Widget Loader

Lazy Widget Loader provides lazy loading for widgets to improve page loading. Use on slow widgets with content from Facebook, Twitter, AdSense ...

markerlyINC

This plugin allows you to install Markerly on your WordPress blog. It’s a social layer that sits on top of your content which prompts users to share when they engage with images, video, and text. You then will get analytics on the backend when you log into Markerly.

Official Markerly Widget

Instant sharing on text highlight/selection to Facebook/Twitter and more!

Lazy Widget Loader vs Official Markerly Widget