A question:

Technically, yes. There's a plagiarism patrol on here, but you have to report any suspected plagiarizing to #steemabuse. If you're talking about academic posts, it depends if it already exists in peer-reviewed and/or published form. You aren't forbidden from posting your past content from other sites, but it's frowned on, because original content is preferred here on Steemit.

Thanks, Vaughn.

(I've been frowned upon a great deal in the past!)