The document presents a framework developed to analyze comments on social media posts by national libraries. The framework aims to better understand user engagement beyond response numbers by looking at what the comment is responding to, if it matches the post content, any emotions or motivations, outside context, and other factors. An initial literature review found thematic discourse analysis allows capturing the complexity of responses. The final 5-point framework analyzes each comment and codes the findings. Early results show the framework provides more insight into why content resonates while identifying response patterns, though more testing is needed as it relies on public data.