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Re:Now Is the Perfect Time for an RSS Renaissance by bmelton on Monday April 23, 2018 @10:44PM (#16909483)
Finger's got them all beat by a few decades.

https://en.wikipedia.org/wiki/Finger_protocol

Re:Now Is the Perfect Time for an RSS Renaissance by Jaruzel on Tuesday April 24, 2018 @02:20AM (#16910329)
id Software used finger heavily during the 90s with regular .plan updates.

There's an archive of John Carmack's .plan files here:

https://github.com/ESWAT/john-carmack-plan-archive