I guess we will find out. If my friends were so concerned about privacy, they wouldn't be downloading all of the FB games that they do...those also get to see in to everyone's friend's lists...but then they can't see it to give your payout, right?
If they pay, they pay, if they don't, they don't. I'm not a mind reader, but we were given the option to put it private. This is really turning out to be something bigger than it needs to be. If someone is not comfortable doing the hit, don't do it. Those who are, then do it. Not a big deal.