In Argentina, the femicide of 14-year-old Chiara Páez in 2015 motivated a self-organized call to agitate against all types of violence against women under the slogan #NotOneLess.1 What started as a Twitter campaign transformed, over time, into the Ni Una Menos movement. Online activism combined with the offline mobilization of thousands of women who took to the streets to express their outrage against gender-based violence.