The invention enables and/or facilitates the display of personalized content to content observers by content providers (e.g., advertisers) who disseminate content over a network. In particular, the invention can be used to enable the display of targeted content to television viewers and/or targeted product placements within a television program. The invention can advantageously enable identification of the content observer(s) observing a content display device at a particular time and/or identification of the content display site, and selection of targeted content for display based on a determination of content appropriate for display to those content observer(s) in accordance with a criterion based on the identity and/or a characteristic of the content observer(s) and/or the content display site.