Is this is a joke? You can't join 12 bounty campaigns at a time, you must only join 1 bounty campaign for you to earn bounty, because if you are going to join that many then it would be impossible for you to wear all of that signature codes and you will be disqualified for doing such thing. But if you mean that you joined 12 bounty campaigns one at a time and you are just now waiting for the distribution of token then it is allowed.
i'm not doing signature campaign, if it is not legal for joining it all together i'm not aware of it, because i'm only a newbie and rank up to jr. member today. i'm doing only twitter and facebook campaign.