When a 22-year-old college student launched an online campaign against the powerful Tokyo Olympics chief and the sexist remarks he'd made, she wasn't sure it would go very far.

But in less than two weeks, Momoko Nojo's #DontBeSilent campaign organized together with other activists gathered more than 150,000 signatures, galvanizing global outrage against Yoshiro Mori, the former president of the Tokyo Organising Committee.

He quit last week and has been replaced by Seiko Hashimoto, a woman who has competed in seven Olympic Games.