Last modified: 2009-06-24 15:40:28 UTC
To prevent nonsense on user pages from coming up on search results pages instead of sourced and NPOV pages in article namespace. Example and more discussion at <http://en.wikipedia.org/wiki/WT:NOT#a_question_of_policy_concerning_WP:SOAP_and_google_indexing_of_user_pages>
If consensus exists for this, it can be added on [[MediaWiki:Robots.txt]].