Yes, that’s the one. JANET was home-grown, whereas Bitnet was a US academic-research network, and it spawned a European related network called EARN - European Academic & Research Network, and there was a linkup (“gateway”) between the 3 of them. Among other things, I remember that EARN had a “chat” system called RELAY, which seemed quite sophisticated at the time (probably quite primitive by modern standards). It had serious purposes, but was also used for “playtime”, as a form of social media, with all the good and bad aspects.
There were also some early systems that worked a bit like internet forums, but without the fancy graphics.Mainly meant for exchange of technical info, or for asking and answering technical questions, but inevitably, that too developed a social side, with good and bad effects.
(I used to take part in one group that discussed “The Archers” (and there can’t be much that is more socially shaming than that! 
).