Established G+ Exodus Communities
As of 13 October 2018, pluspora.com - increased membership from perhaps 100 before the G+ termination announcement (October 9?) to 5500 within a few days.
The MeWe community "Google Plus Refugees" has 124 members. community "Google+" has 20 members.
The Cake interest category "Google" has 189 followers. Recent posts address the demise of G+. The category also tracks other Google-related matters including related consumer devices and working at Google, and others.