That's still the default. There are lots of legitimate use cases for publishing stuff without permission though, e.g. emails from Steve Jobs or whatever.
Normally when social sites get a lot of traction and then die it's because they go into a death spiral of negativity: e.g. Secret, Whisper, Yik Yak, etc. The best practice for avoiding this is to err on the side of too much friction when launching, and then to reduce friction for people who are contributing positively to the community.
That's basically the model we're following. The whole point of the site is to showcase positive interactions between people. E.g. showing conversations between VCs, between academics, lawyers, etc. I think the site is too wonky to get overly negative, but if it starts going that way then we'll be very quick to change things up again.