VH1 | August 13, 2014 10:00 am

By Sarah M. Smith

Except you live under a rock, it’s hard to ignore the latest social movement that’s taken over Facebook, Twitter, YouTube, and Instagram one icy bucket at a time. The Ice Bucket Challenge to strike out ALS (Amyotrophic lateral sclerosis, also known as Lou Gehrig’s Disease) has flooded newsfeeds across America, after originating in the computer of Pete Frates, who was diagnosed with the incurable disease in 2012. Over the last few days everybody’s been doing it: Your neighbor, his dogs, professional athletes, and, of course, celebrities. From Martha Stewart’s salon dunk to Ansel Elgort going shirtless for a good produce, it seems like there isn’t one person in America who hasn’t poured icy water on their head in support of ALS research.

Here’s how it works: When nominated, you must either accept the challenge and fill your bucket or donate $ 100 to ALS, then question others to do the same. If you place of protection’t gotten iced yet, it’s only a matter of time. The latest ALS campaign has led to a 1000 percent increase in donations to the produce. So after you entertain yourself with these iced out celebs, head to the ALS Association and donate. Then maybe send a tweet of encouragement to those stars who have yet to take up the challenge. (They’re waiting for your nomination!)

Ansel Elgort

Ansel’s hot-and-cold selfie video was straight up faultless. Elgort opened the video with his nominations — The Fault in Our Stars author John Green, Nat Wolf, and Dylan O’Brien — before encouraging others to join him in his icy endeavor. And then he closed with some excellent, old fashioned screaming. Because that water is cold!

Justin Timberlake

Nominating Jimmy Fallon and the Tonight Show‘s crew, Justin took on the challenge from two Boston Marathon survivors. Right to his word, JT kept the ice flowing with a few friends… OK, a lot of friends. There’s some honest celebrating there at the end from the Tennessee Kids.

Emmy Rossum

The Shameless star challenged her You’re Not You co-stars Hilary Swank and Josh Duhamel to get a little wet off-set. Bikini ride out or not, that ice water is still freezing cold.

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Tags: ALS, Ansel Elgort, Ice Bucket Challenge, Justin Timberlake, Justin Timberlake, Emmy Rossum, Ansel Elgort