In the hypothetical situation that harassment is prevalent, I'm curious as to what your alternatives to Twitter/Facebook would look like. What would the requirements of joining such a community be?
An alternative to twitter would be filtered, just as you suggest. It could even exclude "offending" opinions. There are plenty of easily offended (but very vocal) people who think all public channels should be like that. However we don't see any startup that is advocating censored speak catching up (I don't even know if there are any, but the social startup space is so overcrowded that there must be some).
So maybe you should reflect on the conditions that have duped you into taking such a simplistic position.
If you want to distance yourself from the documented invasion into the lives and the distinct harassment of women in the industry, my humble suggestion is to pick a new angle from which to fight. How about Doritogate?
I fear we have gotten quite off-topic.
We saw this from the likes of Stalin, Mao, Pol Pot ... to Anti-Gamer-Gate. In this context claims of harassment are a smokescreen that are being used to cover up the exposed corruption. They appeal to the damsel-in-distress narrative that so many men so easily fall for. It's quite an effective strategy, and some guys like John Flynt (aka Brianna Wu) make quite a good living of it seemingly. Maybe you should also try it when your software isn't good: wear girls clothes, send yourself some threatening emails and whine about harassment on TV ... worth quite a stack of paper I hear.
BTW Wikipedia is not a credible source.
That said, the anti-corruption movement is also real. And it is a fact the gg-blocklist does block well behaved non-harassers based on political views.
You both want good things. Why can't you just both agree on ending harassment and be anti-corruption? Those are really not incompatible positions, if you are will willing to look past the us-vs-them tribe mentality.