The main difference in my view is the personalized algorithm that determines what to feed you next.
HackerNews has an algorithm but it's not personalized—i.e. everyone sees the same thing.
My own website has a bulletin board that offers a personalized list of messages after you login: whatever threads you have not yet read. And so do many other websites of this style. So this cannot be a differentiating aspect.
My own website has a bulletin board that offers a personalized list of messages after you login: whatever threads you have not yet read. And so do many other websites of this style. So this cannot be a differentiating aspect.