I think there is no big deal in doing two or more ICO on facebook. It depends on your ability to be able to work hard and makes sure you accumulate your profit
a friend of mine had joined a hundred different facebook and twitter campaigns as many as he could as there is no restriction regarding facebook and twitter campaign as long as he could make a report every week.
since I joined this forum and started to participate on signature bounty campaigns but I didn't dare on joining facebook and twitter bounty campaigns as it has only have low bounty allocation and there are too many participants so participants are only getting low number of coins after the coin distribution.