Ms. Muller, the journalist who first tweeted the “Expose Your Pig” hashtag, said in a phone interview on Tuesday that although she was overwhelmed by the hundreds of reactions she had received, she didn’t want Twitter to become a tribunal. “I’m not a judge,” she said.

Two lawyers for the executive Ms. Muller named in her tweet demanded on Tuesday that she delete it; one of the lawyers, Nicolas Bénoit, called her accusation a case of defamation but declined to comment further. The executive didn’t respond to requests for an interview.

In France, the Weinstein affair has recalled the case of Dominique Strauss-Kahn, the former International Monetary Fund chief and one-time presidential contender who was arrested in New York in 2011 and accused of assaulting a hotel housekeeper. Those charges were dropped, but helped dent a longstanding French reluctance to breach the privacy of public figures, no matter their sexual transgressions.

Sandrine Rousseau, a former leader of the French Green Party and leading advocate for victims of sexual harassment, said the Weinstein case had particular resonance in France because women had suffered in silence for so long.

Ms. Rousseau was one of a dozen women who in 2016 accused a Green Party legislator, Denis Baupin, of sexual harassment, saying he had pushed her up against a wall and kissed her against her will. Mr. Baupin, who resigned as vice president of France’s National Assembly, denied the accusations and the case was dropped on the grounds that too much time had elapsed.

“DSK was the first blow, and Baupin the second one,” Ms. Rousseau said in an interview, referring to the initials of Dominique Strauss-Kahn. “The Weinstein revelations have had a strong echo in France, because what used to be seen as naughtiness is now being considered as sexual harassment.”