CS - Only show content if user is SystemAdministrator

Working with Community Server a common task is to show content specific for a certain role user. Here is a simple example using a placeholder:

<CSControl:PlaceHolder runat="server">
    <DisplayConditions>
        <CSControl:UserPropertyValueComparison
                ComparisonProperty="IsAdministrator"
                UseAccessingUser="true"
                Operator="isSetOrTrue"
                runat="server" />
    </DisplayConditions>
    <ContentTemplate>
        any content...
    </ContentTemplate>
</CSControl:PlaceHolder>

Instead of "IsAdministrator" you could insert "IsAnonymous" in order to show content for unregistered users.