Life isn’t about finding yourself. Or finding anything. Life is about creating yourself, and create things.
Bob Dylan – Rolling Thunder Revue
Usernames are a much, much harder problem than what you might think at first glance… even if you can get away with a really simple and naive implementation on a prototype, a large, global and secure service must consider lots of not-so-obvious details and possible attack vectors.
Let’s talk about usernames deals with the problem with uniqueness, homograph attacks, confusables and other security concerns that you might need to consider.