The vitriol from strangers on Twitter is worst when Kate O'Reilly tweets about politics.
People call her stupid, lob harsh insults and make lewd references to female anatomy. O'Reilly, a longtime Twitter enthusiast from Minneapolis who has more than 5,000 followers, said that she gets harassed by strangers once or twice a month.
"It's hard to gauge what is appropriate, [when to] let it go and what is a real threat," she said.
What's not hard to gauge is the reach of online harassment. From inappropriate name-calling to death threats, cyberbullying is a pervasive and very real problem for adults as well as teens.
"We've created a culture online in which harassment is normal and expected," said Shayla Thiel-Stern, an associate professor at the University of Minnesota who studies social media.
Seventy-three percent of adult Internet users have witnessed online harassment and 40 percent have experienced it, according to the first ever Pew Research report on the topic. While men were more likely to experience some form of harassment, the study — published Wednesday — found women were more likely victims of severe harassment, including sexual harassment and stalking.
The list of examples is long and varied in severity, from personal attacks in online comment threads to leaked celebrity nude pictures to recent death threats against feminist critics of video games.
Cruelty isn't unique to the Internet, but the anonymity and accessibility it offers feed online attacks.