MeWe is another platform that was advertised to users left high-and-dry by the closure of Google Plus. It is not federated, but does make strong claims of privacy protection, and is the slickest alternative I have seen to Google Plus. So when Google Plus disappeared, many people moved over to this platform. https://www.zwilnik.com/?page_id=1030

Links:

https://mewe.com/

https://mewepro.com/

https://mewe.com/store

https://mewe.com/#

https://www.zwilnik.com/?page_id=1030