A survivor of the mass shooting at a Florida high school last week says he has left Facebook after receiving death threats for his gun control advocacy.

"Temporarily got off Facebook because there’s no character count so the death threats from the @NRA cultists are a bit more graphic than those on twitter," Cameron Kasky tweeted. "Will be back when I have the time for it. Busy getting my feelings hurt by fellow teenagers at Br**tb*rt."

Temporarily got off Facebook because there’s no character count so the death threats from the @NRA cultists are a bit more graphic than those on twitter. Will be back when I have the time for it. Busy getting my feelings hurt by fellow teenagers at Br**tb*rt — Cameron Kasky (@cameron_kasky) February 21, 2018

Kasky, a junior at Marjory Stoneman Douglas High School, has become an outspoken leader of the nationwide student-led movement for gun restrictions in the wake of the shooting, where 17 of his classmates and faculty members were killed.

The high schooler challenged Florida Sen. Marco Rubio Marco Antonio RubioSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (R) during a CNN town hall discussion with lawmakers and fellow survivors on gun laws.

“In the name of 17 people, you cannot ask the NRA to keep their money out of your campaign?” Kasky asked Rubio.

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He also organized the "March For Our Lives" movement that will hold a march in Washington, D.C., next month to demand action from lawmakers on gun control.

"In the tragic wake of the seventeen lives brutally cut short in Florida, politicians are telling us that now is not the time to talk about guns. March For Our Lives believes the time is now," the group says on in its mission statement.

Kasky directly also criticized NRA spokeswoman Dana Loesch before she appeared at the town hall, asking "how she can look in the mirror" given her support for gun rights as a mother.