Eleni Kosta Christos Kalloniatis Lilian Mitrou Evangelia Kavakli Search Engines: Gateway to a New "Panopticon"? 11-21 2009 TrustBus http://dx.doi.org/10.1007/978-3-642-03748-1_2 conf/trustbus/2009 db/conf/trustbus/trustbus2009.html#KostaKMK09