From what I've read, the answer is "yes", stackoverflow was crawled. EDIT: I looked and stackoverflow is included in the Common Crawl dataset, which is one of the datasets on which GPT-3 was trained. Having said that, it's not clear to me the degree of coverage of that domain guaranteed by that crawl... looks pretty comprehensive, though. http://index.commoncrawl.org/CC-MAIN-2020-24-index?url=*.sta...