Photo Says It All
Apparently, one person challenges another to donate money to a charity OR have a bucket of ice and water dumped over the head.
It is supposed to raise awareness of ALS*, though on none of the posts I've seen so far does anyone say what ALS is.
And most of the posts indicate that any charity at all is okay.
So, if I'm reading this all accurately, many, many people are publicizing the fact that they would prefer to have a bucket of ice and water dumped over their heads than to donate money to a charity.
*Amyotrophic Lateral Sclerosis, more commonly known as Lou Gehrig's disease, a horrible illness that affects the nerve cells in the brain and spinal column, incurable and progressive, leading to total and complete paralysis and death, within 2-5 years of diagnosis.