Earlier this month on Twitter, people threatened her and her husband with rape, death and castration and posted her address online, she says, and they have been trying to impersonate her on the internet to smear her reputation. She got so frightened that she left her home in Boston.
Wu went to the police, but most people harassed online don't. Says Pew, just 5 per cent of those harassed reported the incident to police, while nearly half confronted the person online.
Victims of harassment often don't know where it's coming from. Thirty-eight per cent of victims say a stranger was behind the threats, and another 26 per cent don't know who the person was.
Among other key findings from Pew:
Two-thirds of those harassed say the most recent incident took place on a social networking site or app, while 22 per cent saw it happen in the comments section of a website. Sixteen per cent say it happened in online gaming.
Men were more likely to be called offensive names than women. Men were also more likely to be physically threatened.
Not everyone says they were hurt by online harassment. While 14 per cent of people found their most recent incident "extremely upsetting", 22 per cent say it was "not at all upsetting".
The telephone and online survey was conducted from May 30 to June 30 among 3217 respondents. Its margin of error is plus or minus 2.2 per cent.