It was originally targeted to students, but more specifically individuals not necessarily students who want to improve on our particular skill. Over time we found out that our user base was about 80% students in k-12 schools, so I added a lot of tools specifically for teachers to manage lots of students, and I've also started targeting educators more in my site copy. It was very unexpected, with my thinking being that schools had their own paid solutions and would not be willing to use an ad supported product, but I was definitely wrong!