No.

My username is the name of my startup. This is a deliberate, calculated tactic to subconsciously infiltrate your mind, so when you finally get around to looking at it, it is so familiar you don't question, criticize or resist, you just submit, and use it.

Joking aside, I think the practice, unless there is some temporary, practical use of anonymity undermines the community component.

I don't sock puppet and (hopefully) don't say things on the internet that I wouldn't say to someone's face. My username is my name [without "The Great, Savior of the Universe, Creator of Large and Small Mistakes" as I'd like at least some anonymity].