What about decreasing bounty reward allocation for social media campaigns? Will it decrease the amount of newbie cheaters, because it will be unprofitable to join even with multiple accounts? It is hard to tell which newbie account is used for cheating, and who is a real newbie that is trying to earn a bit. And for a project - is it huge difference if his project is promoted by one person with lots of accounts or by many people? Project is getting his promotion anyway (but the quality of it is low, I agree with that, but that is a different question).

But, I suggest to accept only accounts starting with Jr.Member rank. Those who are cheating, will get caught during merit distribution most likely. And with time it will be hard to get merit for new accounts to cheat.