Eric Buckley

This plugin adds Social Sharing buttons to the bottom of content in pages and posts.
We have purposely excluded the Home page for inclusion of the buttons. The script should work for custom post types as well.
Please keep in mind this is a very simple implementation. There are no Admin settings or configuration pages. If you wish to have any social networks added that are not shown, please send me a message and I will add these.
<h3>Resources</h3>
We wanted to add a section to provide link to some of the resources we used to make this plugin possible.
Helpful resources:
<a href="https://github.com/bradvin/social-share-urls" rel="nofollow ugc">Social Share URLs</a> – A helpful, open source list of the latest URLs for sharing content on social networks.
<a href="https://fontawesome.com/" rel="nofollow ugc">FontAwesome</a> – A free resource for professional website and application icons.

InstaShare Social Sharing

This plugin adds Social Sharing buttons to the bottom of content in pages and posts, so your visitors can share your website's content.

yanniks

This is the Shariff for WordPress plugin based on c’t Shariff.
For more information, check out the original <a href="https://github.com/heiseonline/shariff" rel="nofollow ugc">GitHub project</a> and the <a href="http://ct.de/shariff" rel="nofollow ugc">c’t information page</a>.
<blockquote>
Shariff enables website users to share their favorite content without compromising their privacy.
Facebook, Google+ and Twitter supply official sharing code snippets which quietly siphon personal data from all page visitors. Shariff enables visitors to see how popular your page is on Facebook and share your content with others without needless data leaks.
Shariff <code>(/ˈʃɛɹɪf/)</code> is an open-source, low-maintenance, high-privacy solution maintained by German computer magazine c’t and heise online.
</blockquote>
Shariff supports sharing buttons for Facebook, Twitter, Google+, LinkedIn, Pinterest, Reddit, StumbleUpon, XING, WhatsApp and mail. 
Select which color you want, set the button location, select the orientation fitting most to your website and set the TTL just as you want.

Shariff for WordPress

Shariff enables website users to share their favorite content without compromising their privacy.

InstaShare Social Sharing vs Shariff for WordPress