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Steemian is used more often due to, my guess, there is actually steamer as a English word not like steamian. So confusion can be avoided.

Thanks, have recently been wondering this.

I think they are the same. When u put an "ian" or "er" at the end, it usually refers to the member of the community. eg Romanian and Youtuber.

Thanks. Should we unify the usage for people playing on steemit?