The statement '@BurtEdwards4 @Columbia 💚' is a response in a thread initiated by a post concerning a political confrontation at Columbia University. The original post by @DrJillStein involves a contentious political issue, specifically addressing a confrontation with a Zionist at Columbia University, which is a significant and sensitive topic. The response by @BurtEdwards4, which simply includes a green heart emoji, does not substantively engage with the political issue or provide any commentary or analysis on the situation. Therefore, it does not constitute public discourse as it lacks substantive engagement with the public issue at hand.