As for removing posts that have been shared from your Facebook page, you cannot directly delete a specific post that someone else has shared. However, you can delete the original post from your page. To do this, go to the upper-right corner of the post, click on the three dots, select “Move to Trash” and confirm by clicking “Move.” Once the original post is removed, any reposts or shares of that content will become blank and won't display your post anymore.