This patent discloses a system to display an online advertisement to a user viewing user-generated comments in an online discussion forum. The system may include an ad server having online advertisements in an ad database. The ad server may include an analyzer to compare compiled metadata to at least two of the online advertisements. The compiled metadata may include metadata from the user-generated comment. The comparison may result in the selection of one advertisement for display with the user-generated comment. The selected advertisement may be called a paired advertisement and the ad server further may serve the paired advertisement to the user-generated comment.
