I'm migrating http://sn.jonkman.ca/ to a new instance, likely httpS://gs.jonkman.ca/ in a month or two, and recreating the groups on the new instance, then decommissioning the old one. I can direct people to join the https://gnusocial.de/group/526/id group instead of recreating the current !OSM group.
I'm considering replacing http://sn.jonkman.ca with httpS://gs.jonkman.ca -- After the bifurcation I found that I didn't really miss the corpus of old messages from identi.ca that didn't get transferred. I was much more interested in the up-to-date conversation threads than in re-reading old messages