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Re:Ask HN: Why prohibit spaces in usernames? by IgorPartola on Monday April 28, 2014 @03:04AM (#7658607)
The second argument does not hold: maryjane and mаryjаne are similar but are different sequences of bytes.

The other issue with spaces is that you cannot easily tell how many there are. For example: "Johnny Appleseed" vs "Johnny Appleseed".

BTW, are there any languages/cultures in which the name structure dictates spaces before/after the name or the number of spaces between words in the name?

Re:Ask HN: Why prohibit spaces in usernames? by ScottWhigham on Monday April 28, 2014 @09:30AM (#7659753)
The second argument does not hold: maryjane and mаryjаne are similar but are different sequences of bytes.

You're nit-picking with that attempt at an argument. If I'm a moderator of a large forum and my user name is "MaryJane", is the community made better when a "Mary Jane" joins? Obviously not - there would be confusion as to who the mod is (regardless of icons/colors/other text used to display the true mod). In marketing speak, "It dilutes the brand".

Re:Ask HN: Why prohibit spaces in usernames? by smartwater on Monday April 28, 2014 @07:52AM (#7659329)
Humans don't parse things byte by byte, his argument is perfectly valid. Yuo cna stlil raed tihs cnat yuo?