"When you load up your site with a host of sharing buttons you're – unwittingly perhaps – enabling those companies to track your visitors, whether they use the buttons and their accompanying social networks or not" [1]."

This can be prevented and in fact, may have to be prevented with the new EU privacy law.

Here is a wordpress plug-in that helps to protect the privacy of your users and helps comply with the new law:

https://de.wordpress.org/plugins/shariff-sharing/

It basically requires you to activate the social buttons first with a click.