Surprised no one has suggested Knowledge Commons https://hcommons.social as an instance that is a haven for scholarly people. Perhaps more in higher education, but K12 educators would be welcome and well taken care of with the good moderation. Formerly Humanities Commons, it has expanded into STEM education and other fields to be more inclusive. Based at Michigan State University, it has government grants and other support to sustain its services.
I also recommend Knowledge Commons for blogging or maintaining a free Website. I was just starting to discuss research repositories and criticizing Academia Edu at https://hcommons.social/@SteveMcCarty/112609326085901837 without having space to suggest open access alternatives like Knowledge Commons. Its repository welcomes teaching materials, syllabi, and all sorts of genres, to which I've been happy to contribute, at https://hcommons.social/@SteveMcCarty
Thank YOU for letting me know you joined the Knowledge Commons instance as a result of my above report on it. They -- @hello -- might also be glad to know this.
Speaking of your mission of films for social activism, through our family friend in Tokyo, I happened to encounter such a group based in NYC led by a Chinese-American woman, with collaborators in Canada and here in Japan. I reviewed their most recent documentary -- available free at https://hi-lo.tv/Our-Work -- on professional photography of Japan's hostess bars, as explained at https://hcommons.social/@SteveMcCarty/112621109879323004
Being a career academic, it was my first foray into a film review or that kind of content, but it all goes toward my challenge as a Japanologist of explaining this inscrutable culture (for once a stereotype is an understatement!). If you happen to contact Hi Lo TV, please give them my regards.