Why can I see different things when I'm signed in?
If you are not signed in then Warwick Blogs and BlogBuilder can't distinguish you from any other member of the public, so you can only see information and entries that the author has chosen to make publicly viewable.
Once you are signed in, Warwick Blogs knows who you are and can show you entries and collections based on your department, tutor group or even your module. In addition, you will be able to see entries where your friends or colleagues have included you in the list of people able to view the entry, and entries which are viewable only by members of the university.