Are the sporges archived on Deja.com?
Yes. When a forgery is made in your name, it also is archived by http://Deja.com. Anyone searching for your posting history will therefore bump into them and, not knowing it is a fake, may think that you are somewhat wacko. As a collateral damage, it also makes any search through Deja difficult. It therefore is a good idea to nuke these sporgeries made in your name.
