A computer system includes a display that displays an electronic program guide to a user. A data storage unit includes keywords related to television shows currently being broadcast. A server device is configured to retrieve real-time data related to a person of interest from the internet by monitoring messages that they generate. The server device can then identify one or more matches between the retrieved data and the stored keywords, and can output a modified electronic program guide including an indication of matching keywords. This can allow an electronic program guide to include an inference of the television show that a person of interest is likely to be watching or talking about online.