You have to keep in mind that you have to share and post a lot (!) when you take part in Facebook campaigns. So you are spamming others Facebook walls and a lot of your "friends" will unfollow you.
Hmm, I don't think so. I joined bounty campaigns many time before and yet I'm not experiencing to be unfollowed 'til now.
Completely agree with that and that's why I think giving stakes only based on friends number isn't the best option
But you can't blame why Bounty Campaigns work the way like that. Of course it's natural for an ICO to want their project make a traffic as huge as possible, right?
That's why giving of rewards on that kind of campaign depends on your friends simply because the more people who can see their advertisement, the more chances for their coin to be sold.
Actually, I don't understand why you are pointing out the difference of real and unreal friends. In advertising, personal connection to your friends doesn't matter a lot (IMO), the number does

.