Branded Keyword as a Username

Is it a good way to use the "branded keyword" in User name while creating forum signup's ? I've just started to sign up in a number of internet marketing forum for my website and using only branded keyword as user name, it's basically a Internet marketing website.

Hmm... I'm guessing not. You can try it, but usernames are known to be so random that if Google were smart they'd have ignored then for content value long ago.