Mashable lists seven people who were "trolled" off Twitter. Although many more have likely quit the social media site, these celebrities took a harsh, public hit.

Lena Dunham, creator and star of Girls, said she was tired of reading, for example, "10 mentions that say I should be stoned to death." Iggy Azalea went off social media sites after a body-shaming photo of her in a bathing suit went viral. The most recent is Leslie Jones, star of the new Ghostbusters movie. Jones was subjected to racist and sexist comments by a known troll, who encouraged users to send her pictures of apes.

Twitter continues taking heat for not reacting quickly enough to shut down users' accounts. Jonathan Weisman, a New York Times editor who experienced anti-Semitism on Twitter, wrote, "I am awaiting some sign from Twitter that it cares whether its platform is becoming a cesspit of hate. Until then, sayonara." Journalist Julieanne Smolinski wrote, "Perhaps make hate speech a terminable violation of your terms of service,@twitter? Just a reasonable humane thought." 

Discussion Starters: 

• Should Twitter do more? This isn't the first time the company has been criticized. 
• Is trolling worse on Twitter than on other social media sites? If so, why do you think this is the case?