Google+ provided a platform for many millions of regular users to interact over years. It will be shut down in August, 2019, as announced in October of 2018.
The goal is for those of us who’ve cultivated a significant personal social network on Google+ to carry that forward to some new platform(s).
PlexodusWiki serves the population of present and former Google+ users seeking to continue their community across future platform(s).
User:Dredmorbius is organising this, User:JollyOrc runs it. There are many others.
Most of us are present or former users of Google+, and numerous other online services.
This site runs MediaWiki.