Since the shooting attack at Marjory Stoneman Douglas High School in Parkland, Florida, on Feb. 14, a student there, Sarah Chadwick, has amassed a Twitter following of more than 150,000 people. Thursday night, Chadwick decided to share a thought with them.

Was it time for a message calling for thoughts, prayers and privacy?

Hardly. It was time to go after one of Florida’s U.S. senators for taking donations from the National Rifle Association.

“We should change the names of AR-15s to ‘Marco Rubio’ because they are so easy to buy,” Chadwick wrote.

This is what politicizing a tragedy looks like, and the kids are determined to keep doing it.

With 17 of their classmates and faculty shot to death, the students have become celebrity activists whom many left-leaning Americans have embraced as the new leaders of the nation’s gun control movement.

The students have been bold, confrontational and even abrasive, rarely holding back their anger, even if it means disrespecting their older, establishment opponents. They say what they mean.

“Honestly, just using brutal honesty – that’s it,” said student David Hogg, one of the movement’s most prominent voices. “I know people are saying it’s intense. I would argue the opposite. We’re fighting for these kids that died because they can’t fight anymore. We’re really trying to get justice for them.”

“Everybody deals with grief in a different way. For me, it’s anger, and wanting to prevent whatever caused it from happening again,” Hogg said.

The students’ stridency has added pressure on lawmakers and kept the shooting from fading from the headlines.

It has also insulted right-wing adversaries several times, including by implying gun rights supporters have the 17 deaths at Stoneman Douglas on their hands.

“Sen. Rubio, it’s hard to look at you and not look down a barrel of an AR-15 and not look at Nikolas Cruz,” student activist Cameron Kasky told Rubio at CNN’s Wednesday night town hall with students, parents and lawmakers. The remark drew scorn from the right.

“No thanks, Cameron,” a writer at the conservative website RedState.com fired back at the student later. “I don’t need some 17-year-old putz to defend my kids. In fact, either of my daughters, particularly the 13-year-old, can kick your ass. And when it comes to choosing sides, I’m on the other.”

The students have also faced accusations of being disrespectful brats.

“Parents, what would you do if your child lectured and ridiculed a U.S. senator on national television?” Todd Starnes of Fox News said on Twitter after Kasky and other students ripped into Rubio.

The kids know exactly what they’re doing, and they don’t care about the criticism.

“When these politicians kill our friends, why are we expected to play nice?” Hogg said. “Obviously it’s due to their inaction; that’s what we’re aiming at.”

Hogg’s prominence has led to a backlash of conspiracy theories accusing him of not being a student at the school.

It also led him to question who, exactly, has been lowering the discourse.

“You know what’s disrespectful?” Hogg said. “Calling out witnesses to a mass shooting and calling us actors. That’s disrespectful. And even questioning whether we were even … there.… We are teenagers … we’re not known for being mature, but come on.”

The students’ advocacy has also been expressed in the language of their generation, which is well-versed in the combative “dunks,” “burns” and “owns” of arguing on social media. They know how to speak into their own cameras and they know how to play to audiences online, so when a fight breaks out on social media, it’s on their turf.

While the movement has inspired students at schools around the nation to walk out of classes in support of gun control, the history of 21st century activism has shown that there are upsides and downsides to organizing over social media.

Platforms such as Twitter excel at helping newfound activists to create and document conflict, and to attract ever-larger audiences for their own messages.

Their visibility also helps recruit like-minded peers outside their communities.

But over the long term, social media platforms can also pose a risk to activist movements by magnifying and publicizing disputes between members or creating bitterness among core supporters who play key roles but who attract less public attention.

So far, few signs of internal dissent seem to have broken out among Stoneman Douglas students, whose cohesion has struck longtime advocates as unique.

“I don’t think we’ve ever seen an entire community, including the survivors, have a clear call to action,” said Shannon Watts, founder of Moms Demand Action, a gun control group.

In past mass shootings, it has been common for family members of victims to become passionate, outspoken gun control advocates.

But in Parkland, “it’s as if all of them agreed immediately that stronger gun laws would prevent anyone else from going through this tragedy again,” Watts said. “These teens are realizing they don’t have to live this way, they don’t have to die this way.”