When using third-party Apps like Postcron to post to Facebook Pages, you’ll notice that sometimes a tag is automatically added to your posts indicating that it was posted through a partner and not directly from Facebook.
The tag is usually only visible for admins. But if you’d like to choose who can see that your posts are posted through Postcron, go to your Business Integrations and change the privacy setting on the Postcron App settings page. You can learn more about this here.