Excerpt from this article:
Women are posting messages on social media to show how commonplace sexual assault and harassment are, using the hashtag #MeToo to express that they, too, have been victims of such misconduct.
The messages bearing witness began appearing frequently on Twitter, Facebook and Instagram on Sunday, when the actress Alyssa Milano posted a screenshot outlining the idea and writing “If you’ve been sexually harassed or assaulted write ‘me too’ as a reply to this tweet.”
…The #MeToo movement is not the first to use social media to highlight abuse against women. In 2014, a #YesAllWomen campaign drew notice on social media after a man cited his hatred of women as his reason for killing people in Southern California. The activist Laura Bates started the #EverydaySexism campaign in 2012 to document widespread sexism, harassment and assault.