Messages to wall by Rules.

Hello,
Sharethis buttons aren't used for linking to user's own media service page/account.
ShareThis buttons and widget allow sharing to social channels. So the share will always be posted to the user's wall/timeline to which the share was posted to. There's no way that the posts shared across different walls gets posted to your wall (unless someone shares that article/page with you). Hope this information is helpful.

The ShareThis Support Team
http://support.sharethis.com

I am closing this support report, as it already got an answer.