A new study from the Pew Internet Project reveals the widespread nature of online harassment and the different forms it takes. According to the study, 40 percent of Internet users say they have experienced some form of harassment online, in varying degrees of severity.

“The data show that men are more likely to experience name-calling and embarrassment, while young women are particularly vulnerable to sexual harassment and stalking,”  the study’s authors write. “Social media is the most common scene of both types of harassment.”

The dominance of social media in this area is striking. A full 66 percent of those subjected to online harassment said it occurred on a social networking site or app, while only 22 percent reported that it occurred in the comments section of a website. 16 percent reported harassment during online gaming.

Also noteworthy is that 22 percent of those surveyed found the harassment “not at all upsetting,” suggesting that perhaps skins are staring to grow thicker on the Internet, at least for less serious forms of harassment.

But when it comes to the most severe types of online harassment, the study found that young women bare the brunt of it.

“Young women, those 18-24, experience certain severe types of harassment at disproportionately high levels: 26% of these young women have been stalked online, and 25% were the target of online sexual harassment,” the study’s authors report. “In addition, they do not escape the heightened rates of physical threats and sustained harassment common to their male peers and young people in general.”

The fallout from such harassment has been in the news recently, with feminist media critic, Anita Sarkeesian, forced to cancel a Utah event after an anonymous threat of a school massacre, and actress and prominent gamer, Felicia Day, having personal information revealed after speaking out on Gamergate.

Sadly, most social media companies have yet to put any safeguards in place to protect victims of Internet harassment. Twitter, in particular, has faced growing criticism, and has vowed to change its policies.