2020-01-08 UTC
# 
petermolnar [tantek]: if I remember correctly, Xanadu wanted symmertical links; basically what webmentions are sort of aiming to do, as in everything existing knows about everything incoming. I'm aware it never happened. See Hpyer-G though, which achieved some of it, then fell into oblivion: https://much.isds.tugraz.at/projects/hyper-g/9.htm/