Just to add to the long discussions about real identity on SO and the value of your online persona.
When a question is migrated to a different site your name goes with it, even if you have no login on that site. You have no say in this, you can't delete the question or remove your name without creating a login to the site - which will then be linked to all your other sites.
So you answer a question of the etymology of peadophile on English.SO and find this has been migrated to sex-abusers-recovery.SO with your name attached to the bottom.
Or worse, your answer about lisp has been migrated to emacs.so leaving you indelibly associated with emacs in the googlplex
Should identifying info be stripped from a migrated question if you don't have an identity on the new site?
Should you have the option to prevent your answers being migrated?