The role definition has a right to view items, personalize Web Parts, use alerts, and create a top-level site. A reader can only read a site (2); the reader cannot add content. When a reader creates a site (2), the reader becomes the site (2) owner and a member of the administrator role for the new site (2). This does not affect the user's role membership for any other site (2). Rights included are CreateSSCSite, ViewListItems, and ViewPages.