I don't hold the belief that Lesswrong discussion contains only people who are at the cutting edge of EA theory. I don't think you do either.

Non sequitur. I don't hold this belief but I nevertheless think that Less Wrong would be better than Facebook for pushing forward the state of EA. Reasons include upvotes, searchability and preservation with less headache for the moderator, threading, etc.

I can hardly think your bandwidth would be better invested elsewhere

You just gave me some great reasons why your own bandwidth is better invested elsewhere. I'm surprised that you can't think of analogous ones that might apply to me right now.

Anyway, I think this is an important problem but not the important problem (as you seem to think I think), and also one that I have quite a large comparative disadvantage in solving correctly compared to other people, and other important problems that I could solve. If no one else decides it's worthy of their time I'll (a) update against it being worthwhile and (b) get around to it when I have free bandwidth.