same. it happens to me all the time on HN.
on one hand, i feel like this is a text-book example of the Bader-Meinhoff illusion [0].
but... there's an actual causal mechanism that could drive it.
show an interesting article to the HN crowd -> some subset of HN readers are inspired to go down a wikipedia rabbit hole and post some cool thing they found back on HN -> people that saw the original interesting post will not only see the related followup post, but they'll upvote it and cause even MORE to see it