On: Twitter funding a team to develop an open standard...

[Gaelan]

The terminology I've most commonly seen used is this:

Centralized = One central system runs everything (i.e. Twitter, Facebook)

Decentralized = Multiple central systems run everything, but they talk to each other and you can build your own (i.e. email, Mastodon/ActivityPub)

Distributed = No central system at all (i.e. Bitcoin)

[miguelmota → Gaelan]

> Distributed = No central system at all

I can have a single non-distributed computer system and have that single computer be decentralized by having the programs it runs be done through achieving consensus. Your definitions are a bit off because Mastadon and Bitcoin are both distributed and decentralized systems.

[M2Ys4U → Gaelan]

Decentralised implies distributed (although the inverse is not true - one can have a distributed yet centralised model).