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Re:Ask HN: How brand name usernames are handled? by brudgers on Tuesday January 13, 2015 @02:10PM (#8881842)
I'd go even further and be proactive. Prohibit names with obvious potential to cause problems during sign up, e.g. fail to validate:

   *google*| *iphone* | *microsoft*
with a "username not available".

It won't entirely avoid the problem -- you can't stop the truly determined from creating problems -- but it will stop the casual lol's.

Re:Ask HN: How brand name usernames are handled? by aswerty on Wednesday January 14, 2015 @03:37AM (#8884995)
It does seem like a reasonable step to take because any 3rd party who takes such a username does piggy back on the brand reputation of these companies; intentionally or not.
Re:Ask HN: How brand name usernames are handled? by brudgers on Wednesday January 14, 2015 @11:04AM (#8887075)
There is a Github repository waiting to be made.