News last week that country crooner LeAnn Rimes had entered treatment for anxiety and stress echoed that of another celebrity's distress, several thousand miles away.

One day prior to Rimes' announcement, Australian television personality Charlotte Dawson was hospitalized after a suicide attempt in the early hours of the morning. The host of "Australia's Next Top Model" had spent much of the night retweeting the onslaught of hateful messages on her Twitter account, before signing off "Hope this ends the misery ... You win x." (Dawson would later admit that the "death threats" had "triggered that feeling of helplessness when the trolls got to me. They got the better of me and they won.")

Closer to home, Rimes had been dealing with an undue dose of Internet vitriol. Those following Rimes' story know that fans of Brandi Glanville (the ex-wife of Rimes' husband, Eddie Cibrian) had been particularly harsh on the 30-year-old singer. On August 31, the day after she entered treatment, Rimes let it be known that she would be fighting back. The country star filed a lawsuit against a woman who she alleges illegally tape-recorded their conversation without her consent -- the same woman who has been tweeting "mean and derogatory things about LeAnn for years," according to Rimes' lawyer.

The two incidents are sobering reminders that cyberbullying continues to be a major element of Twitter, and all social media generally. Online expressions of hatred show no signs of subsiding, even towards -- or especially towards -- celebrities, who can often seem untouchable. Stars from Nicole "Snooki" Polizzi to Lady Gaga have spoken out about being victims of cyber hate. That makes them part of the 20 percent of social media users who have been victims of online bullying, according to Dr. Sameer Hinduja, co-director of the Cyberbullying Research Center. A further 20 percent of the online population, he says, are offenders.

Harassment on Twitter can quickly go viral in ways other forms of communication cannot, Dr. Hinduja said. "Most people are extremely familiar with texting. It's a one-on-one transaction that takes place. But when you think about using Twitter primarily from your smartphone, there's a misconception in that we're disarmed to think it is just like a text, even though we've got all of these followers who then receive that text message as it's broadcast."

"Celebrities are humans. I think people forget that sometimes," said Courtenay Semel, the daughter of former Yahoo executive Terry Semel. Semel became a familiar face after appearing on the 2005 reality TV show "Filthy Rich: Cattle Drive."

Semel said that Internet hatred contributed to her last stint in rehab. "There was a time in my life when I didn't have the coping mechanisms, and it didn't matter what anyone said. It didn't matter if a friend said to me, 'Well, don't go on your social media,' or 'Imagine what the other person looks like on the other side of the screen.' Why should I not go on my social media for someone else?"

Semel's comments may help explain why so many celebrities continue to use Twitter, even after receiving negative attention. How do they endure it? "You have to build up a tolerance from it. You kind of have to laugh about it, and realize they must be having a bad day. You know, go worry about yourself, why are you worrying about what I'm doing? Why attack someone you don’t know?”

"Kids get the idea that the online environment is almost like Las Vegas -- what happens online is going to stay online," said Deborah Temkin, Research and Policy Coordinator for Bullying Prevention Initiatives at the U.S. Department of Education.

With celebrities, the litany of messages, twitpics and other forms of media can also lend an unrealistic sense of familiarity, Temkin explained. "With people tweeting about more personal things than you would get in even tabloid news, it does to some extent invite people more into their personal lives, and may drive a little bit more of that connection, of feeling that you know them, of feeling you can talk badly about them."

While former Disney stars Demi Lovato and Miley Cyrus have actively campaigned to end cyberbullying, neither has quit using Twitter. Instead, Cyrus is turning the responsibility back onto the platform itself. "I won’t tolerate someone telling me 2 die. I think Twitter needs to take some responsibility and make it a safe environment!" the 19-year-old Cyrus wrote.

But if Twitter is contemplating significant changes with regards to cyberbullying, the company is remaining tight-lipped about them. When asked by The Huffington Post about the cyberbullying that takes place on its platform, a spokesperson for Twitter directed us to a section of its support pages that said, "As a policy, we do not mediate content, including potentially offensive content." When asked whether the company considered it their responsibility to police user harassment, in much the same way the company verifies accounts, the Twitter spokesperson again directed HuffPost to a section in the policy and declined to elaborate further: "If the account is in violation of our policies, we will take action, ranging from warning the user up to permanently suspending the account."

In the meantime, there are immediate solutions to try to stop cyberbullying from happening to you. According to Temkin, one should keep two main things in mind. "Don't respond. A lot of the times, whether in life or online, the reason why the kid is bullying is they're looking for a response," she said.

And the other? "Keep a record. One of the unique things about cyberbullying is that there's a readymade record.”

Celebrity Photos Of The Week:

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  • Celebrity Photos: April 2014

    Khloe Kardashian did some shopping with her mother Kris in West Hollywood on April 24.

  • Celebrity Photos: April 2014

    Newlywed Jodie Foster grabbed a smoothie in LA on April 24.

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    Emma Stone stopped by the "Good Morning America" studios in NYC on April 24, with her "The Amazing Spider-Man 2" co-stars Andrew Garfield and Jamie Foxx.

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    Tori Spelling's husband Dean McDermott had a heated exchange with a paparazzo in LA on April 23

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    Jessica Alba landed in NYC on April 23.

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    Rumer Willis attended the 5th Annual Elle Women in Music Celebration presented by CUSP by Neiman Marcus in Hollywood, Calif. Hosted by Elle Editor-in-Chief Robbie Myers, the April 22 event featured performances by Sarah McLachlan, Angel Haze and Betty Who.

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    Eddie Murphy's daughters Shayne (left) and Bria Murphy attended Elle's 5th Annual Women in Music concert celebration on April 22 in Hollywood.

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    Jason Sudeikis shared a laugh with Rebecca Hall on set of "Tumbledown" in Boston on April 22.

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    Taylor Swift engaged in some retail therapy in NYC on April 22.

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    Drew Barrymore gave birth to her second child, a baby girl named Frankie Barrymore Kopelman, on April 22.

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    Cameron Diaz attended the premiere of "The Other Woman" at the Regency Village Theatre in Westwood, Calif., on April 21

  • Celebrity Photos: April 2014

    Katy Perry headed to Jimmy Kimmel's studio in Hollywood, Calif., on April 21.

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    Sofia Vergara wowed at "Good Morning America" on April 21.

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    Selena Gomez went on a coffee run in Studio City, Calif. on April 21.

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    Busy Philipps and husband Marc Silverstein had some fun at Coachella on April 20.

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    Gwen Stefani headed to her parents' house on Easter Sunday, April 20, with her husband Gavin Rossdale and three kids, Kingston, Zuma and Apollo.

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    Tia Mowry soaked up some sun in Cabo, Mexico with her husband Cory Hardrict on April 19.

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    Jennifer Lopez and boyfriend Casper Smart had a casual dinner at Madeo in West Hollywood on April 17.

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    Aubrey Plaza, Jason Ritter, Dade Constantine, and Kayla Dobson attended the "About Alex" premiere afterparty during the Tribeca Film Festival at Kutsher's Tribeca in NYC, April 17.

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    Pregnant singer Christina Aguilera and her fiance Matthew Rutler were photographed out and about in New York City on April 17.

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    Katie Holmes spotted out and about in New York City on April 17.

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    "Downton Abbey" actress Jessica Brown Findlay hopped on a train at Manchester Piccadilly Train Station after her interview on "BBC Breakfast" on April 17 in England.

  • Celebrity Photos: April 2014

    Heather Graham visited NBC Studios for an appearance on "The Today Show" on April 17 in New York City.

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    Justin Bieber and his crew, including Lil Za, were spotted out for dinner at The Grove in Los Angeles, Calif., on April 16.

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    Georgia May Jagger, daughter of Mick Jagger, filmed a commercial for Rimmel London in London, England, on April 15.

  • Celebrity Photos: April 2014

    Halle Berry filmed scenes for her TV series "Extant" in Century City, Calif. on April 15.

  • Celebrity Photos: April 2014

    Lauren Conrad did some shopping in West Hollywood on April 15.

  • Celebrity Photos: April 2014

    Andrew Garfield, Emma Stone, Jamie Foxx and Dane DeHaan posed during a photocall for their film "The Amazing Spider-Man 2" prior to the German premiere of the film in Berlin on April 15.

  • Celebrity Photos: April 2014

    Kim Kardashian and her fiance Kanye West walked hand-in-hand as they went shopping in Givenchy, Balmain and Lanvin on April 14 in Paris, France.

  • Celebrity Photos: April 2014

    Channing Tatum and Jenna Dewan-Tatum joked around backstage at the 2014 MTV Movie Awards at Nokia Theatre L.A. Live in Los Angeles, Calif., on April 13.

  • Celebrity Photos: April 2014

    Lupita Nyong'o arrived at the 2014 MTV Movie Awards at Nokia Theatre L.A. Live in Los Angeles, Calif., on April 13.

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    Taylor Swift and a friend were spotted out and about in New York City on April 12.

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    Jessica Biel was all smiles as she headed out for an espresso in New York City on April 12.

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    Leonardo DiCaprio stopped by the McDonald’s® and Stingray Desert Coachella Pool Party at the Bootsy Bellows Estate on April 12 to celebrate the launch of McDonald’s® Bacon Clubhouse Burger™ and the 2014 Corvette Stingray.

  • Celebrity Photos: April 2014

    Julianne Hough looked Coachella cool at The Old Navy Oasis in Indio, Calif.m on April 12.

  • Celebrity Photos: April 2014

    Selena Gomez and Kendall and Kylie Jenner at the first weekend of The Coachella Valley Music and Arts Festival on April 11.

  • Celebrity Photos: April 2014

    Emma Stone and Andrew Garfield visited BBC Radio 1 in London on April 9 to promote their new film, "The Amazing Spider-Man 2."

  • Celebrity Photos: April 2014

    Pregnant Kristin Cavallari was spotted running in West Hollywood on April 9.

  • Celebrity Photos: April 2014

    Danica McKellar left "Dancing with the Stars" practice in Hollywood on April 8.

  • Celebrity Photos: April 2014

    Julianne Moore was pretty in white while out in NYC April 8.

  • Celebrity Photos: April 2014

    Anne Hathaway wrapped herself up in a giant coat while out in NYC on April 8.

  • Celebrity Photos: April 2014

    Lady Gaga struck her usual unique pose outside the Roseland Ballroom on April 7.

  • Celebrity News: April 2014

    British socialite <a href="http://www.huffingtonpost.com/2014/04/07/peaches-geldof-dead_n_5105968.html" target="_blank">Peaches Geldof died</a> of an "unexplained and sudden" cause on April 7. She was 25.

  • Celebrity Photos: April 7

    "Dancing with the Stars" star Derek Hough took a break from rehearsal on April 7 to snack on the new Ritz crackers.

  • Celebrity Photos: April 2014

    Jamie Lynn Sigler was spotted purchasing a Rembrandt whitening kit at Target in New York on April 7.

  • Celebrity Photos: April 2014

    Faith Hill and Tim McGraw at the 2014 Academy Of Country Music Awards at the MGM Grand Hotel & Casino in Las Vegas, Nevada on April 6.

  • Celebrity Photos: April 2014

    Miranda Lambert and Blake Shelton at the 2014 Academy Of Country Music Awards at the MGM Grand Hotel & Casino in Las Vegas, Nevada on April 6.

  • Celebrity Photos: April 2014

    Carrie Underwood at the 2014 Academy Of Country Music Awards at the MGM Grand Hotel & Casino in Las Vegas, Nevada on April 6.

  • Celebrity Photos: April 2014

    Taylor Swift at the 2014 Academy Of Country Music Awards at the MGM Grand Hotel & Casino in Las Vegas, Nevada on April 6.

  • Celebrity Photos: April 2014

    Cameron Diaz made an appearance on "Wetten, dass..???" TV show on April 5 in Offenburg, Germany.

  • Celebrity Photos: April 2014

    Heidi Klum attended the "America's Got Talent" red carpet event at Madison Square Garden on April 4 in New York City.