When clacks got introduced, the description of people who just enjoyed being there and spending time on coding messages and talking to unknown remote people.. well, it felt like early internet, fidonet, perhaps AM radio amateurs.
It really seemed like Pratchett knew something of this niche cultures, way more than I expected.
He was active on Usenet. I remember seeing his messages.
> It really seemed like Pratchett knew something of this niche cultures, way more than I expected.
He was definitely an early adopter of the internet, (and e.g. very active on alt.fan.pratchett), so that's no big surprise.