If you would browse 1-100, then 100-200, changes are you are going to see the same links twice, and miss other links, just because the result set had changed in

If you would browse 1-100, then 100-200, changes are you are going to see the same links twice, and miss other links, just because the result set had changed in between the two requests. And caching a snapshot per user seems a bit expensive. Pagination is a mess on Reddit and HN, so maybe he considers pagination "hard to get right"., since no social news aggregator gets it right.