My question involves defamation in the state of: Arizona
I am a writer and blogger writing about controversial subjects in Arizona. I have joined many "causes" pages on Facebook that support my point of view to gather information for my writing and voice my opinion. In the course of this I've unfortunately attracted the attention of people who vehemently disagree with my point of view including one person who has used my name as as his own to post comments both on Facebook and on other online sites, including news articles. His posts espouse ideas are directly in conflict to my own and include hate-speech and even condone violence. He has changed one letter in my name (and sometimes he also uses my middle name, again with a couple of letters changed but since my name is unusual it's obvious that he's imitating me) I've had numerous people ask if it is I who is making these postings.
I've taken screenshots of his posts and reported to the Internet Crimes Complaint Center as a defamation of character but am wondering if I have any grounds here, especially since I do have an online presence that includes publication of my own writing online and a reputation that I value greatly.
Any advice would be most welcome.