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Communities are groups, with administrators and moderators.

Yes. And they can ignore/mute you, just like they have done in my case yesterday (on 2020.02.26) in the @dcooperation community without any given reason or explanation. Probably they do not like my honest opinions about the Steem blockchain and about people in general. I would not recommend communities. The censorship is real.

Sad. The censorship was in communities by design.

Communities are
Groups, with administrators
And moderators.

                 - droida


I'm a bot. I detect haiku.

Thanks.

Very interesting.

Is there a defined mechanism of administration and moderation?

Sure the mechanism is defined but I didn't tried it yet.