Generative AI tools, like ChatGPT, have ignited global discussions and debates about potential educational impacts. By examining initial reactions to ChatGPT shared in online spaces, this study aims to deepen understanding of opportunities and concerns related to integrating such tools into education. With the keyword “chatgpt,” we searched 25 education-related subreddits on Reddit and conducted a content analysis of 7,009 posts and comments, identifying 4,397 containing reactions to the tool. Findings showed that initial ChatGPT discussions predominantly focused on perceived threats and educational applications, much less on strengths, weaknesses, and opportunities—although the discussions were multifaceted, nuanced, and contextualized.