From another question related to the use of the Google search engine in combination with Stack Exchange, I found the following.
I have some accounts I solely use for flagging. Those profiles are set to hidden in my network profile. However, the user profiles do pop up in the search results in Google. And even worse, all those profiles put my actual contribution to page 17...
I know the sites hidden in your profile aren't really hidden, although this seems an unwanted side effect.
Can SE prevent the hidden profiles from popping up in Google? And if so, should they?