A simple, two-word phrase flooded Facebook, Twitter, and Instagram on Sunday night and Monday morning: “me too.”
Women posted the phrase at the urging of actress Alyssa Milano, who on Sunday suggested that women write “me too” if they’d been the victim of sexual harassment or sexual assault.
“If all the women who have been sexually harassed or assaulted wrote ‘Me too’ as a status, we might give people a sense of the magnitude of the problem,” she wrote.
The campaign, which Milano credited to a friend, came amid a snowballing scandal related to the alleged sexual misconduct of film producer Harvey Weinstein.
Subscribe: The Broadsheet, Fortune’s newsletter on powerful women.
As of Monday morning, more than 6 million Facebook users were “talking about” me too and the #metoo hashtag was trending on Twitter.
Some women simply wrote the two words, while others used it as an opportunity to share stories about their abuse.
Milano, who starred in Who’s the Boss? and Melrose Place, also appeared in Charmed alongside actress Rose McGowan, who last week accused Weinstein of raping her. (Through a spokesperson, Weinstein denied allegations of non-consensual sex.) Twitter briefly suspended McGowan last week as she tweeted about the Weinstein scandal, which prompted another outcry of female solidarity as women boycotted the social media platform to protest its silencing of women’s voices.