It was also simultaneously submitted to lobste.rs (https://mastodon.social/@lobsters/115093242443397877) , and is on multiple Hacker News robot feeds such as https://mstdn.social/@hkrn/115093327746058961 , of course. At minimum, every node that has replicated that FediVerse post has done a fetch in order to construct a thumbnail (because the headlined URL is first).