I've joined Economics StackExchange very recently, and personally I like to read the questions, vote and answer, as a way to maintain the connection to my bachelor studies in Economics, which I finished in 2011. Working in Business for so long, I missed a place where it is simple to read, answer and discuss economics, not just one-way reading interesting books or The Economist.
I'm writting this as an idea on where to get more members: besides academia, look at alumni from economics courses, or people who are interested and know a lot.
Another point is the answers rate: again, my personal experience is that I don't look at all the fields, for instance I skip several questions on models due to lack of memory and patience to review, but am very active answering questions more related to money supply or real world / management issues. This is something that might divide the community: the more theoretical, model driven vs. the more journalism like economists. What do you think about this?
One thing that I found strange at the beginning (dont take it as a criticism) was that practically all questions were edited by 2-3 people (luchonacho, denesp and alecos), which felt like strong moderation.
But my key point to the thread would be: with 3 years of beta and a large community of visitors, make it a real website ;)