Yeah, basically the rules are you donate and do the challenge, then dare others to do the challenge as well. If they refuse they are supposed to donate a higher amount or something like that. I have seen dozens of these from people I know and celebrities lately. Bill Gates' was pretty cool. Built a whole rig to dump water on him.
On the same note, I have seen some people pussy out and use like 6 ice cubes in a bucket. Not impressing me. Fill a tub up with ice and take a soak and then I'll be impressed.
Got a good laugh out of this though. I wanna see Maria do it too!

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