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T-Mobile CEO John Legere and CMO Mike Sievert participated in the Ice Bucket Challenge on Wednesday.

It seems almost everyone is having ice water dumped on their heads — top tech CEOs included.

In a campaign called the “Ice Bucket Challenge,” thousands of people around the country are raising awareness for ALS by having a bucket of ice water poured on themselves, and then challenging another person to do the same within 24 hours — those who decline are asked to donate to ALS research or a charity.

Thanks to social media, the ALS Association and its 38 chapters have received $4 million in donations in the past two weeks, compared to $1.12 million during the same time period last year.

Microsoft CEO Satya Nadella participated on Tuesday, allowing a group of employees to douse him in cold water. He then challenged Google CEO Larry Page and Amazon CEO Jeff Bezos to do the same:

Also on Tuesday, Facebook boss Mark Zuckerberg accepted a challenge from New Jersey Gov. Chris Christie and challenged Bill Gates, Facebook COO Sheryl Sandberg, and Netflix CEO Reed Hastings:

Twitter CEO Dick Costolo participated and challenged Seattle-based Zillow CEO Spencer Rascoff:

And Rascoff accepted the challenge, and asked LinkedIn CEO Jeff Weiner and CNBC’s Jim Cramer to do the same:

After being challenged by CNBC’s Carl Quintanilla, T-Mobile CEO John Legere and CMO Mike Sievert got wet on Wednesday. Unsurprisingly, Legere challenged the CEOs from Verizon, AT&T, and Sprint:

Even Seattle startup CEOs are spreading awareness, too. Julep CEO Jane Park participated on Wednesday in front of a Shell gas station, and challenged execs from Zulily, Nordstrom, and Starbucks:

And here’s Zulily CEO Darrell Cavens, who challenged Blue Nile CEO Harvey Kanter and Maveron’s Dan Levitan:

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