Originally this was a thread for coordinating conversations at EA Global 2019. In the end, only I ended up using the thread for top level comments, and in fact it turned out that a lot of the value was getting to quickly hash out some ideas that I hadn't felt ready to turn into fully fledged posts.
I'll probably continue using this for EA-related shortform posts, as a parallel to my lesswrong shortform feed.
Membranes
A membrane is a semi-permeable barrier that things can enter and leave, but it's a bit hard to get in and a bit hard to get out. This allows them to store negentropy, which lets them do more interesting things than their surroundings.
An EA group that anyone can join and leave at a whim is going to have relatively low standards. This is fine for recruiting new people. But right now I think the most urgent EA needs have more do with getting people from the middle-of-the-funnel to the end, rather than the beginning-of-the-funnel to the middle. And I think helping the middle requires a higher expectation of effort and knowledge.
(I think a reasonably good mixed strategy is to have public events maybe once every month or two, and then additional events that require some kind of effort on the part of members)
What happens inside the membrane?
Membranes can work via two mechanisms:
The first option is easier. Giving feedback and expelling people is quite costly, and painful both for the person being expelled from a group (who may have friends and roots there), as well as the person doing the expelling (which may involve a stressful fight with people second-guessing you).
If you're much more careful about who you let in, an ounce of prevention can be more valuable than a pound of cure.
On the other hand, if you put up lots of barriers, you may find your community stagnating. There may also be false positives of "so-and-so seemed not super promising" but if you'd given them a chance to grow it would have been fine.