Our safety guide at Feminist Frequency is a little out of date in parts (we’re working on that) but still has loads of good information especially around how your friends can help you during difficult times online (available in English, Spanish, and Arabic): https://onlinesafety.feministfrequency.com/en/
We also spoke with Susan Wismar, a sexual violence prevention specialist and in our talk discussed good tips on what to do with when witnessing harassment: https://www.youtube.com/watch?v=KccqKhH0jjU
PEN America has great resources in their Online Harassment Field Manual, including support for witnesses and bystanders: https://pen.org/online-harassment/
If you work for a company, recommend that they sign up for Tall Poppy to safeguard all their employees. It’s honestly one of the best automated, self help, online systems I’ve seen so far: https://tallpoppy.com/
And while it isn’t there yet, the Games and Online Harassment Hotline (https://gameshotline.org) is currently building a streamlined, human centered, automated way to help folks feel safer online.
Great tips for ANYONE that chooses to speak up against any kind of harassment.