user name on blogs

Hello,
I would like to create 30 blogs and submit my articles there.
I am planning to spin the content a little bit . Is it OK to register with the same user name or is it better to change my user name each 30 blogs?
For example, if I type someone?s user name on Google, many URLs with this user name appear . Maybe administrator of blog site will type my user name on Google and will see that I posted to many sites and will ban my account?

Can anyone give the [FONT=&quot]advantages[/FONT] and disadvantages of [FONT=&quot]registering with the same user name ?[/FONT]
[FONT=&quot]If you had this kind of experience ,please share it with me .[/FONT]
[FONT=&quot]Thank you![/FONT]

if anything, i'd think it would be more of a security issue, as if you're lazy enough to want to use the same username, you'll probably use the same password on all 30 too... just not smart imo.