From Georgetown University Commons Knowledge Base
Changing the privacy settings
Log in to the administrative side of your blog and go to Settings ➝ Reading. You have five options:
The first option will mean that your posts could show up in Google's search results!
The second option will make your site to be visible to anyone if they have the link or know the URL.
The third, fourth, and fifth options will make your site visible only to Georgetown users as specified.
To change your privacy setting, select your new option and "save changes." Students and student groups should alert their faculty advisors that they have made their blogs public if they decide to do so.