DO what all other guys said (excel table etc..) , and also try to start with 1 or 2 bounty campaigns no see how it is , when you are more confortable with it and now how it works with organization you can do a lot of them at the same time
Yep. I can see a lot of the same suggestions

). Maybe it's the only way to manage large amount of social bounties at a time

. I don't really know if there is any other way. But I think I really should join 2 or 3 social bounties at the moment and then when I get used to with this I'll start using spreadsheet to manage my campaign

Yes it is the only way you can track your all records and don't forget to update your spreadsheet. if you join 2 or 3 bounties then no problem but if you join more than 3 bounties you will get confused. and have enough free time then participate in more bounties or else don't take the risk. because health is important.