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Decent Decentralisation
(hachyderm.io)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Usually that decoupling already takes place on the level of VPS providers who are really good at providing a commodity service, but personally I think it is in the best interest of any slightly larger community to run their own hardware servers.
Yes it takes some effort to do so, but only when running your own servers can democratic governance of an instance really work, otherwise you are always beholden to various limitations of the VPS provider and its pricing structure.