I'm going to bring this thread back to its original topic. I did some talking and some digging tonight, and it seems to be time to pull up a few relevant links. It's pretty obvious that Community Advocacy is working on harassment issues, including gender-based harassment; I understand a blog post is imminent, as is a serious effort at gathering data from the community. In the interim:
Reminder of commitment and work that is underway with Community Advocacy - I have been assured that it has continued despite Philippe's having left the WMF:
https://meta.wikimedia.org/wiki/Grants:IdeaLab/Community_discussion_on_harassment_reporting#EndorsementsSome of the research they have gathered and reviewed - and maybe some of this will be useful for communities directly as well: