To help spread awareness about Amyotrophic Lateral Sclerosis (ALS), three technical giants executives take on the Ice Bucket Challenge.

Microsoft co-founder Bill Gates, Apple CEO Tim Cook and Amazon CEO Jeff Bezos have a bucket of ice water dumped over their heads.

The challenge starts with one person who has ice water poured over them to challenge someone else to do the same or make a donation to the ALS campaign.

Gates took on Facebook CEO Mark Zuckerberg dare, after water has been dumped on him; he then dared Tesla CEO Elon Musk, TED Conference's Chris Anderson and American Idol's Ryan Seacrest.

Several Hollywood actors have also done the ice bucket challenge for ALS awareness campaign.

The Ice Bucket Challenge has gone viral and is fast gaining popularity, attracting big Hollywood names such as Justin Timberlake, Martha Stewart and Jimmy Fallon.

The Verge reported that United States President Obama did not take the challenge but donated to the fight against ALS.

According to ALS Association web site from July 29 to Aug. 12, it has received $4 million in donations

 "We have never seen anything like this in the history of the disease," said Barbara Newhouse, President and CEO of The ALS Association. "We couldn't be more thrilled with the level of compassion, generosity and sense of humor that people are exhibiting as they take part in this impactful viral initiative."

The web site added that Ice Bucket Challenge is making difference and stated that since July 29, the Association has welcomed more than 70,000 new donors to the cause.

The money goes to finding a cure and ensures that those afflicted with ALS gets the care they need.

ALS said there are about 5,600 people in the U.S. diagnosed with ALS each year. "The incidence of ALS is two per 100,000 people, and it is estimated that as many as 30,000 Americans may have the disease at any given time," it noted.