Eugene Volokh, UCLA Professor, Report on Search Engines and First Amendment Rights.

"White Paper" written by UCLA Law Professor, Constitutional Rights Attorney Eugene Volokh, commissioned by Google, regarding the Free Speech rights of Search Engines and Google being a "Publisher".

http://www.volokh.com/2012/05/09/first-amendment-protection-for-search-engine-search-results/

Here is the Article by Eugene Volokh UCLA Professor

http://www.volokh.com/wp-content/uploads/2012/05/SearchEngineFirstAmendment.pdf