Shared content normally show a link at the top of the page to where it is published. For instance, a place blog that is shared:
Here is an example of a personal blog that is shared:
However, System blogs are a special type of blog that doesn't belong to a particular container, although they can be "shared", i.e. added to the activity stream of a place. This is done intentionally because the actual purpose of the link at the top is to allow it to be "removed" from those places, whereas a system blog is ubiquitous and cannot belong to or be removed from any particular place.