The statement 'We pray that everyone has had a blessed Mother’s Day!' accompanied by an image with a quote from Abraham Lincoln about his mother's prayers, does not constitute public discourse. It is a general well-wishing message related to Mother's Day and does not engage in any substantive discussion on public issues, policies, or societal concerns. The quote from Abraham Lincoln adds a historical and emotional element to the message, emphasizing the importance of maternal influence but does not engage in a debate or policy discussion.