An audiovisual content posting system enables a user to post audiovisual comments in response to instances of audiovisual content such as podcasts. The user identifies a specific instance of audiovisual content on which s/he wishes to comment. The audiovisual content posting system prompts the user to record an audiovisual comment, and automatically transmits the recorded audiovisual comment to a destination associated with the content that is the subject of the comment. The audiovisual content posting system can automatically maintain a database storing identifiers of multiple instances of audiovisual content as well as electronic addresses to which to transmit comments thereon. The audiovisual content posting system can then detect changes to these electronic addresses, and automatically update the database accordingly. When the audiovisual content posting system transmits a comment, it can retrieve the appropriate, current electronic address to use from the database.