One of the most delightful things involving reading HN is seeing a strange, context-less post in the morning, and then, later in the day or evening, coming across another piece of information- maybe a popular article on another website or a very popular youtube video- that then leads you to some research hole, possibly wikipedia'ing and following the older, linked sources- where you wind up on the exact page linked from the random post that morning and it becomes pretty obvious that you just retraced the exact steps that a like-minded individual had done earlier that day.

It's happened to me several times where I doubt it could be simply recency bias coupled with chance of topics, due to the specificity and narrow directed-ness of the graph.