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I've read the post How do comment @replies work?, but I am not sure I understood how to refer correctly to a user, for example, Sha Wiz Dow Ard. If I got it right, I have to write @ShaWizDowArd because spaces must be ignored.
Does it mean that there are no users called "ShaWizDowArd", "ShaWiz DowAr", because they wouldn't be unique usernames?
Talking about name + surname, does it mean that if there's a user called "John Smith" I can't register as "JohnSmith" or "John-Smith"?
How can I be sure my @referral is correctly written and interpreted? Is there a way to know if I referred to the right person? Why don't you write a link in "href style" to the user I'm referring to?