ts may be associated with an STB.FIG. 21 is a flowchart illustrating a method by which user demographics may be associated with an STB.FIGS. 22(a) through 22(l) are components of a sample STB demographic table.FIG. 23 is a flowchart illustrating a method by which advertisements or other content can be delivered to a user with a high probability of the user actually experiencing the content.FIG. 24