STEVEN F
Social media, but it isn't a crime.
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There is no such crime. For the most part anyone can post anything about you they wish. The only exception would be libel where you can prove damages.
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The namr is public disclosure of private facts. It's a tort which ain't a crime.
Anonymous
Copyright, Liabel have been mentioned, but if you have an established presence (entertainer, business owner, other personalities) that suffers a blow to finances or reputation, you can slap them with slander as well if it is untrue.
Murzy
It depends on what they have posted. Liabel, copyright infringement, etc.