currently I am one of the assistant bounty managers, currently there are many cheaters who follow the campaign that we are managing and what we find that the cheaters are starting to act again with multiple accounts by creating a new bitcointalk account to join the bounty then using other people's social media link profiles
Some managers don't hide social media profile links in public spreadsheet. They create application form for people to fill in and apply but never mind to hide those profile links when they publicly show spreadsheet.
Cheaters can easily to get access to those sheets with links in Bounty topics and can save those social media profile links for cheating later. I don't think they can use those links too much because if they join social media campaigns, they will be required to make tweets, status on Twitter and Facebook, but they never get access to those accounts and won't be able to fullfil tasks. They only be able to cheat with unprofessional and lazy managers.