Going back to the Area 51 proposal, one of the interesting (and intreguing) aspects of this site has been the sense of a gathering of cultures. Besides the division between university and K-12 teachers, I've also noticed that some of us are:
- new to Stack Exchange,
- new to the Math/MathOverflow section of Stack Exchange, or
- old hands on the Math-related communities.
For those who don't know, MathOverflow was the most successful Stack Exchange 1.0 site before being incorperated into the network. (It's doing quite well here too.) As a result, MathOverflow took a divergent evolutionary path. In particular, it missed a number of technical and policy adjustments. At the same time, MathOverflow found ingenious solutions to its stable feature set and formed its own culture. I found this wishlist very helpful to understanding what's different between MathOverflow and the majority of sites on Stack Exchange.
Meanwhile, there's a contingent of people who come from regions of the internet that aren't strictly focused on the Q&A format. For those folks "forum" and "discussion" aren't verboten words. A lot of fairly typical things done on a Stack Exchange site seem foreign and arcane until you get used to them. (I've been there.)
At any rate, there are people from several different cultural backgrounds that have different approaches to solving social problems. As a rule, cultures clash when people assume that others share their unspoken assumptions when they do not. Therefore, putting those assumptions out in the open builds one path to greater understanding. (Don't forget to always apply Hanlon's razor; assume good faith.)
Personally, I think this site will be stronger in the long run for having such a diverse heritage. But I also urge you to forge your own path and create a culture best suited to Mathematics Educators. At the same time, you might as well avoid the mistakes we've learned from in the past. Take what's best from your collective experience and build something new.