The statement 'Happy 420' accompanied by the image does not constitute public discourse as it does not engage substantively with public issues or policies. The statement itself is a casual or celebratory remark related to the date known for its association with cannabis culture. The image, however, contains a quote discussing policy changes regarding marijuana legalization and its implications, which could be considered public discourse if analyzed separately. However, the initial statement 'Happy 420' itself does not meet the criteria for public discourse analysis.