I would suggest bounty managers to make a limit of accepted newbies and jr.members in campaigns. Even if the campaign uses stake system, accepting first 100 newbies and jr.members would be enough. Not a secret that most of the newbies that join twitter and facebook campaign are part of farms. They follow each other and their project posts and tweets get less response and interest from society, as they share everything round each other. For projects such promotion is a waste of budget. However, these newbies create a hype or noise on social media. That is why not accepting them will be wrong, but making a limit of accepted might help.