As someone who was using BBSs by 1984-ish, I can believe that people met this way. What I can't believe is that it was at a percentage high enough to be represented as anything above zero on that graph.
The data are nationally representative, as the Ipsos KnowledgePanel recruits subjects into the panel by by Address Based Sampling, and subjects without Internet access at home are given Internet access.
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Response rate was 3510/6753=52% in 2017, 2107/2431= 87% in 2020, and 1722/2073=83% in 2022.
Half of all randomly selected subjects (by address) responded to their survey? I'd need to read a bit more about what exactly is going on there.
University nerds with early access to early forms of Internet would definitely never utilize such serious world changing technology to chat and dawdle amongst themselves to the point a connection would form. It's not like the entirety of video gaming was created by a nerd severely misusing an extremely expensive oscilloscope.
Not quite the 80s, but I met my wife online in ‘93 or ‘94. Initially it was just a passing conversation a few times. We met in earnest in ‘95. She does not remember the initial meeting, we were both using different screen names.