At 17 years old, Greta Thunberg has become the face of the youth climate movement. She's also one of the internet's savviest Twitter trolls.

After actress Amanda Henderson incorrectly guessed that Thunberg's name was Sharon on the TV show "Celebrity Mastermind," Thunberg quietly changed her Twitter handle to read simply: "Sharon."

This isn't the first time Thunberg has changed her Twitter bio to reflect mentions of her by politicians and celebrities.

In December, she changed her bio twice in response to insults from President Donald Trump and Brazilian president Jair Bolsonaro.

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On Thursday's episode of "Celebrity Mastermind," actress Amanda Henderson faced this question: "The 2019 book entitled, 'No-One is Too Small to Make a Difference' is a collection of speeches made by a Swedish climate change activist. What's her name?'"

Henderson gave a blank look, then answered: "Sharon."

The correct answer, of course, was Greta.

Greta Thunberg, who turned 17 on Friday, has emerged as the face of the global youth climate movement. She has also become quite a savvy Twitter troll. In this case, Thunberg capitalized on Henderson's gaff by changing her Twitter handle to simply read: "Sharon."

A screenshot of Greta Thunberg's Twitter profile on Friday, January 3, 2020. Twitter Screenshot

This move is the latest in a series of Thunberg's clever responses to politicians and celebrities — including President Donald Trump — who have referenced her in public.

Thunberg has trolled Trump twice

Usually, Thunberg's Twitter bio reads: "17-year-old climate and environmental activist with Asperger's." But that can change depending on which world leaders insult her.

On December 12 , Thunberg's bio said: "A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend."

That came in response to President Trump, who tweeted that Thunberg should "work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill!" Trump's statements followed the news that Time had named Thunberg the magazine's 2019 person of the year — a title for which Trump had also been in the running.

A screenshot of Greta Thunberg's Twitter bio on December 12, 2019. Screenshot of Twitter

Thunberg also cleverly clapped back at Trump in September, after he mocked her for giving a fiery, impassioned speech to UN leaders. Trump tweeted: "She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!"

Less than 24 hours later, Thunberg changed her Twitter bio to: "A very happy young girl looking forward to a bright and wonderful future."

Thunberg and President Donald Trump. Youtube

Bolsonaro, Putin, and Macron

On December 10, meanwhile, Thunberg's bio briefly read: "Pirralha." That translates to "little brat" or "pest" in Portuguese — a reference to comments Brazilian President Jair Bolsonaro made about her that week.

Bolsonaro referred to Thunberg as a "pirralha" after she denounced the killing of indigenous Brazilian people in the Amazon in a tweet on December 8. She included a video of a drive-by shooting that left two indigenous leaders dead in Maranhão, Brazil.

"Indigenous people are literally being murdered for trying to protect the forest from illegal deforestation. Over and over again," Thunberg wrote on Twitter. "It is shameful that the world remains silent about this."

Bolsonaro was clearly irked.

Brazilian President Jair Bolsonaro. Ueslei Marcelino/Reuters

"Greta's been saying Indians have died because they were defending the Amazon," Bolsonaro told reporters in Portuguese. "It's amazing how much space the press gives this kind of 'pirralha.'"

Russian President Vladimir Putin has also weighed in on Thunberg — and saw his comments reflected in her Twitter bio. In October 2019, Putin said he did not share "the common excitement" about Thunberg, but added he was "sure that Greta is a kind and very sincere girl."

Thunberg once again edited her bio to read: "A kind but poorly informed teenager" in reference to Putin's platitude.

Russian President Vladimir Putin with French President Emmanuel Macron. Sputnik/Alexey Nikolsky/Kremlin via Reuters

French President Emmanuel Macron, meanwhile, told Europe 1 in September that Thunberg's argument that countries' inaction on climate change violates the UN Convention on the Rights of the Child was "very radical" and likely to "antagonize societies."

He was referencing a legal complaint that Thunberg and 15 other children filed naming five countries: Argentina, Brazil, France, Germany, and Turkey.

"All the movements of our youth — or our not so young — are helpful," Macron said. "But they must now focus on those who are furthest away, those who are seeking to block the way."

Macron added that he didn't think "the French government nor the German government, currently, were blocking the way."

The next day, Thunberg retweeted a video posted by UK television personality Mark Humphries titled "THE GRETA THUNBERG HELPLINE: For adults angry at a child."

Thunberg at the COP25 climate conference on December 9, 2019, in Madrid, Spain. Pablo Blazquez Dominguez/Getty

The video stars a man who acknowledges he's "irrationally angry at a Swedish girl who wants to save the planet."

A patient female operator explains in the video: "If you're a grown adult who needs to yell at a child for some reason, the Greta Thunberg Helpline is here to tolerate you."

'They must simply feel so threatened'

The comment that inspired Thunberg to tweet on the most serious note, however, came from conservative commentator Michael Knowles. The night after Thunberg's speech at the UN in New York, Knowles appeared on Fox News' "The Story" and called Thunberg "a mentally ill Swedish child." Fox later apologized.

That time, Thunberg tweeted a long thread that did not acknowledge Knowles by name but called out "the haters."

"As you may have noticed, the haters are as active as ever — going after me, my looks, my clothes, my behavior and my differences," she wrote. "I honestly don't understand why adults would choose to spend their time mocking and threatening teenagers and children for promoting science, when they could do something good instead. I guess they must simply feel so threatened by us."