Find Wordpress Blogs where new user is author?

Hi,
i am not sure if it possible do get a search sting for that.

The idea behind the question is easy. Finding Blogs where you can sign up and you are author so you can write articles.
I find blogs with a bit luck which where configured like that so i thought about if it is possible to get a search sting for that.

Thanks that you are listening to my wired thoughts ;-)

Dont know how to help you, but I support your request, is a very interesting way of linkbuilding.

I left one of my blogs open like this by mistake and a month later I had over 1000+ articles from tons of different niches. It's good way to build links until the webmaster notices and deletes them all.

@Lakitu
The same happens to me i left a blog open - means a new member was author.
However i am pretty sure that there are a lot of this blogs which are forgotten ones. So this links will stay.

However the question is left how to spot out blogs wehre you are author after signup.