I disagree with that statement. I know it's fashionable on HN to spit on Reddit, but for all its flaws, Reddit also birthed fantastic communities that are hard to replicate somewhere else due to the network effect, e.g. /r/WarCollege, /r/hoggit, /r/AskHistorians, /r/Rust, /r/LinguisticsHumor, etc. – come for the dumb memes, stay for the niche communities.