You can use (addtoany code) share buttons
from this link : https://www.addtoany.com
And it is better to use Widget Anywhere Plugin
for locate the share buttons in any where you like
You can do a custom widget that would cause zero-load to you website server. Because it wont include any js, img, css files or mysql queries.
Just assign the link you want to share to a variable, say $share_link, and use following links to share in facebook or twitter.
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Jan 12, 2019: Q2A 1.8.3 released!