I realised that on HN it's quite acceptable to do this (although normally posts from the past would be prepended/appended with a (YEAR). I believe the reasoning is that not everyone has seen these articles, and as they are more than just news, many of them are worthy of occasional re-discussion over time. For example, this blogpost (https://news.ycombinator.com/item?id=5204324) about Julia-lang was posted in 2012 and then in 2013, and a comparison of HN's discussion over time is quite interesting (to me, at least).