/\ /\ Good point - very valuable information. /\
I signed up through my uPromise login. I don't know if that constitutes a referral or invitation but it said I would receive $2 for signing up.
CS stressed that only one account is permitted per person, but it seems to be determined in the system by e-mail address. It seems doubtful they'd catch multiple accounts as long as it has a different e-mail address. I followed the procedures as provided by CS and it worked, but maybe they were already aware that uPromise wasn't turning anybody away.