I've been back for a few days, and people are apparently mobbing some random other people who asked for help developing a survey because they wrote about transgender issues in a way that seemed condescending and clueless. This is called "SurveyFail". The targets were hounded out of the community.
From here, these look like the same thing. It looks like the people doing this are smarter and more ethically grounded than SomethingAwful goons and Anonymous, but despite limiting their tactics and having ends that seem more just, they are indulging in the same impulses rather than treating their fellow human beings with compassion or doing something useful about the problems they say they hope to address.
I'm glad none of my friends seem to be directly involved this time. Kept at a distance, it's just dull and uncomfortable.