When you see your ads live on Facebook, you may notice a little grey note under the name of the page you used to publish the ad.
This note is displayed to you because you have managing permission on that page.
This is Facebook way to let all Admins (and people with a role for the page) know who-did-what. These are private comments, not visible to end-users.
You get a similar information if you post something on one of the pages you manage, you see a little grey note saying : published by you
Look at the post here
- as an admin of the page I see the post as following:
- while if I'm not connected as admin, I see only a post published by the page