Invite codes are a good way to limit access as you ramp up and also let you have a rough idea of which users are externally connected, even if it is not very ac

Invite codes are a good way to limit access as you ramp up and also let you have a rough idea of which users are externally connected, even if it is not very accurate. I'd say use as a marketing ploy is limited, unless one can successfully foster some kind of "gotta have" site before and during launch, and the vast majority of sites don't fit this bill.