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Spacer Widget
You can only see the Spacer Widget when you're logged in and only you can see it. Its purpose is to create a blank space inside your profile page (for example, it can be used to show a particular area of the background image of your profile).
Once the widget is enabled, you can set the height of the blank space you are creating by simply clicking the "+" and "-" buttons or by inserting the exact height in pixels.