Edmodo is one of the startups whose name pops up a lot when you talk about "edtech." Founded in 2007, the company is almost old school, yet, in spite of the influx of new education-focused startups, Edmodo continues to press forward. This is largely due to due to its appeal as a social learning platform for K-12 education - one that has earned it the "Facebook for the classroom" moniker - meaning that Edmodo enables teachers to share to share content, manage projects, assignments and notifications, distribute quizzes and events - both among students and colleagues. But the real key, and where it departs from being synonymous with an "educational Facebook," is that all this collaboration and classroom management takes place within a network that it completely private and secure.