On your profile page, only things you create will ever show up. The access controls for the widgets there determine who can see the widget,not what content is shown.

The dashboard is a different matter and should display content from all users (depending on what access settings they have for each piece of content). If everyone sets their access on blogs to private you won't see anything but your own stuff on the dashboard.

Also, check your default access level (admin>Site Administration) to see what it is set to.