> From those I've had the pleasure of discussing the important topic of Internet BBS posting with, knowing the nationality of other posters is one of their favorite features.
Some poster maybe don't want others to know their location.
Maybe you can work with IDs here. On 2ch there is this thing that if you post from overseas your ID ends with ! I think. Or you could enable it by writing 'flag' or something in the email field. Just don't make it permanent and mandatory for everyone