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I disagree, actually: one thing I have learned from my friends outside of our online or development world is that most people see URLs as a vaguely incomprehensible string that they copy exactly. There is a tendency to add "www" if there isn't one to the beginning of a URL, but generally visitors are just going to copy and paste whatever is in their address bar when sharing. So, I would just make sure that any "www"s are 301 redirected to their non "www" version of the URL. Good luck!