Hi there,
Thanks for contacting AddThis Support!
Looks like you’ve enabled address bar tracking, which appends those parameters to your URL. They’re there so that we can collect analytics when someone copies the URL out of the address bar instead of going through our sharing tool. It shouldn’t affect people linking to your site and can provide insight into what content is the most popular on your site.
Here’s some additional information on the importance of address bar sharing:
https://www.addthis.com/blog/2013/10/17/url-cut-paste-a-big-part-of-content-engagement-you-might-be-missing
If they’re not wanted or are causing issues, you’re free to disable address bar sharing tracking. Just adjust your addthis_config variable like this:
<script type=”text/javascript”>
var addthis_config = addthis_config||{};
addthis_config.data_track_addressbar = false;
</script>
More information about address bar sharing analytics is available here:
https://www.addthis.com/help/address-bar-sharing-analytics
Please let me know if you need further assistance and thanks so much for using AddThis!