I founded a non-profit that organizes learning circles for people to learn together. We used to focus on online circles, but found that we mainly reached people who were already fairly well educated. 18 months ago we switched to exclusively working with public libraries to host our learning circles, and we couldn't be happier with the results. We now see about 65% first time online learners, most are without a college degree, and even homeless people have joined. And working with the librarians has been awesome. Public libraries for the win!