Yes. There are some key examples of it that have occurred on Facebook. Groups of women did come together to organize a response to Facebook's refusal to remove gender-based violent images and content. It took quite some time. It was started by a group in the United Kingdom. They were very successful at pushing back on Facebook.
I think we've seen some of this happen more recently in the last four months on Twitter as well. I think an organized speaking-back campaign can make a big difference. It has to marshal not just individuals but often advocacy groups, which can get a little more attention because they can cross over many different kinds of social media platforms.
There are some stories out there, even those that don't directly intersect with cyber-harassment and cyber-bullying, such as women who spoke back against Instagram and Facebook for taking down their family photos of themselves nursing, but women who are nursing are being picked up by algorithms that are searching for nudity.
There are ways in which people do organize to push back on violence online and on violent speech and hate speech. They have been successful.