I ran into three errors while validating my page with the plugin installed. They are easily fixed:
The plugin currently does not close the path tag within the svg element which errors on validation with w3c. The error text is the following:
End tag svg did not match the name of the current open element (path).
The Twitter button should use
&instead of an ampersand before the url argument
For the LinkedIn button the ampersand before summary should be changed