I was reading this excellent post about tzedakah and it seems that after a person is mafrish (designates monies as) tzedakah and the recipient disappears, he can give it to someone else. That made me think of the following question.
Can you donate Tzedakah with no-one in mind? Does there have to be a poor needy intended recipient at the time of the donation for it to be considered Tzedakah, or is there a theoretical pool of Tzedakah money where I can donate money to and then later decide who will get it?