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The interface. It's purposely hard to use (read: not impractical, but takes a while to learn). Reddit's downfall was it was too easy for middle schoolers, high schoolers, etc. to pick up and use for "le may-mays". It's too easy to have a subreddit with nothing but imgur posts. Most defaults are 95% images. Hubski encourages thoughtful text, scientific articles, and intelligent conversation. Just the way the website is designed. Hopefully it works though...