2018-09-20 UTC
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@sil ↩️ https://kryogenix.org/days/2014/11/29/enabling-webmentions/ discusses that in more detail, along with webmentions and how they might be a good replacement; they haven't seen much take-up, though. (There's much less of a community now than there was when I invented pingback.) (twitter.com/_/status/1042741819879116801)