The statement '@MichaelCartyNE @USC 🍉' does not constitute public discourse. It appears to be a brief, possibly cryptic or humorous response to a more substantive conversation regarding a demonstration at the UPC campus and a call for divestment. The use of a watermelon emoji does not clearly address or contribute to the civic dialogue on the issue at hand, nor does it provide any substantive engagement with public issues, debates, or discussions.