How to install WordPress Social Sharing Optimization - Improves Shared Content on Social Websites plugin:
Go to Wordpress admin area and click "Plugins" and then "Add New" menu item.
In the right panel (left top) you will see "Upload Plugin" button. Click the button.
Next click the "Choose file" button in right panel (center).
Select zip file of the "WordPress Social Sharing Optimization - Improves Shared Content on Social Websites" plugin located on your hard drive and press "Open".
Click "Install Now" and the zip file will upload to your site.
Now click "Activate" button to activate the "WordPress Social Sharing Optimization - Improves Shared Content on Social Websites" plugin.
We've tested following plugins published by: Jean-Sebastien Morisset