Hi Krileon,
thanks for reply.
It´s especially the googlebot I like to restrict.
An other idea could be to integrate a special "code" into the URL of "plan B"-Users. Is it possible to "add" a word or code after the username in the URL? For example:
Normal url:
http://www...../username
url with added word (-plan-b):
http://www...../username-plan-b
With this additional word I can set a parameter in the Google Webmastertools, that they don´t index all urls with "plan-b" in it. That would help, too.
Can I do this with the auto actions or an other tool?