I don't think that's allowed, at least not on freebitco.in. I'm pretty sure each account is only supposed to be used by 1 person, see a quote from TheQuin below.
What the heck are you talking about? Any number of people can use a single account in any site. That is common sense. No gambling site would have issues with this logic and they wouldn't be able to differentiate in the first place unless the gambler specifically told them.
I was talking about multiple people claiming from the faucet on the same account.