Between September 16–26, social media discussions about Bangkok flooding reached 40 million engagements across 167,607 posts, with Facebook dominating (70.5% of posts, 20M engagements) and TikTok proving highly efficient (4.5% of posts, 14M engagements). Key themes included real-time reporting of flooded areas, weather forecasts vs. government credibility, emergency helplines, and citizen self-organization—reflecting how Thais bypass official channels during crisis response.