Hello,
The SThash is a feature of our CopyNShare plugin, which is an addition to our regular ShareThis plugin. If you would like to disable CopyNShare, you can find detailed instructions on how to do so at our customer FAQ page:
http://support.sharethis.com/customer/portal/articles/517332-share-widget-faqs#copynshare
Please let us know if you have any further issues! We hope you will continue to use CopyNShare, which allows you to track all the sharing that occurs when a user copies and pastes your website’s URL or content. This, in addition to allowing your site’s visitors to share to over 120 social channels, provides valuable information about the content and social media traffic on your homepage.
To find out more about ShareThis’s revamped social analytics tools, visit us at: http://sharethis.com/publishers/metrics-dashboard#home
