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Usernames of only periods and spaces shouldn't be allowed
This username shouldn't be allowed: . .
It's hard to even see that it is a username link most of the time, it's probably problematic for @ commenting, and it's dehumanising and anti-community as it discourages other people from putting any mental image together of the person. And if anyone else makes an account with a different number of spaces it would be almost impossible to tell them apart.