It is unclear who started the hashtag - which has been used nearly 6,000 times - but many are replying to actress Alyssa Milano's post explaining the objective of "Me Too".
A growing movement of women sharing their stories of assault and recovery has taken the identity of #MeToo, a hashtag being shared on Twitter, Facebook and more.
Debra Messing, star of Will and Grace, Anna Paquin, the Oscar-winning actress from New Zealand, and Labour MP Stella Creasy are among those who have spoken out using the hashtag.
It started with Alyssa Milano, who tweeted the following on Sunday afternoon.
Milano starred in Charmed with actress Rose McGowan, who was one of the first actresses to be named as an alleged victim of Weinstein.
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Women led by the Alyssa Milano's unique campaign came in support of "Me Too" as it trended on all social media platforms. "To the women who have come forward against a system that is created to keep you silent, I stand in awe of you and appreciate you and your fortitude". Singer Lady Gaga also tweeted the hashtag.
Many women in the U.S. and France appeared to be speaking out for the first time about abuses they had suffered, often saying they had to overcome feelings of shame and embarrassment to do so. Others detailed their own experiences. One user wrote about the time she was held by a group of boys at school as they were trying to see "what her bra was stuffed with", which resulted in the boys getting no more "than a slap on the wrist", as she was told to learn to take a joke.
Milano called the Weinstein allegations "disturbing" in an essay last week, but added that she had been reluctant to comment publicly because of her friendship with Weinstein's wife, Georgina Chapman.
British actress Lysette Anthony says she reported to police on Wednesday that Weinstein raped her in her London home in the late 1980s.