this post was submitted on 29 Jul 2024
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[–] squirrel@discuss.tchncs.de 25 points 3 months ago (2 children)
[–] Thade780@lemmy.world 10 points 3 months ago
[–] Dymonika@beehaw.org 1 points 3 months ago (1 children)
[–] squirrel@discuss.tchncs.de 4 points 3 months ago

ICQ, one of the first messengers. Every user had a unique number, like phone numbers today.

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