Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. It's where your interests connect you with your people.
Internet - both as a stack of technologies and as the vector of a sharing culture - brings us credible alternatives to classroom-based education in schools and universities. Most of them involve video lectures, with clear advantages: the pause button, the rearranging of content in 6-20 minutes packets, and the ability to attend from anywhere, at any time. Furthermore, the locus of learning is not so much the lecture, as the peer-to-peer interaction among students, through forums wikis, Twitter lists, Facebook groups et cetera. All of this is hardly news: I have discussed it before, and even test-driven the model.