alt Hacker News> Way back before social media existed, things like BBS' and later on newsgroups were similarly extremely addictive.
I'm not so sure about this (having lived both). The "algorithm" has a massive addictive effect that simply was not present in the BBS days, it is nearly universally agreed. Certainly it's believed enough for Meta to spend billions on it.
This is one of those topics that LLMs are quite good at for digging up information and consensus on, because they've been trained on stuff that you may have either forgotten or not been a part of the culture of. BBS were universally deemed extremely addictive. Early telnet BBSs then brought this up to an even more ridiculous extreme. Their usage even cropped up on early studies of internet addiction like this. [1] And similarly for usenet/newsgroups.
I think the algorithm's primary purpose is to be able to more seamlessly push ads. I also think that at some point there was a sort of dystopic interest in seeing if people could be controlled by content. Facebooks emotional control experiments are public validation of that. But these are again tangential red herrings once we establish clearly that addiction happens even without such, and it certainly did and does.
[1] - https://eric.ed.gov/?id=ED416838