I have the sense that many of the current followers for this site are (like myself) mostly interested in college teaching. Certainly the example questions seem to lean towards college teaching, although there are several excellent questions about teaching K-12 mathematics.
I suspect that this is a function of how the site was advertised — there is certainly a preponderance of college professors and math Ph.D. students on Math Stack Exchange and MathOverflow, and the result of advertising on these sites is that we get the same preponderance here.
This worries me, because teachers at the K-12 level are a much larger audience than college teachers, and I think it's vital to the future of this site that we attract more of this audience. These things have a tendency to perpetuate themselves: if most of the questions are about college teaching, then the site appeals mostly to college teachers, which means that most of the participants we attract will be college teachers, which means that most of the questions will be about college teaching.
So my question is, are there any good ways to attract more K-12 teachers at this stage? For example, are there any websites frequented by K-12 math teachers that we could advertise on?