(One question by António Pedro Pereira e Manuel Pimentel)
I see three generations of Distance education pedagogy. The first based on behavioral/cognitive designs and focused on independent learning and delivered by books and one way mass media. The second based on constructivism with paced online learning groups using both synchronous and asynchronous technologies. And an emerging 3rd generation based on networks and connectivist designs. These allow, but do not require that relationships be formed with current and past students studying the same materials. You might want to read works by Jon Dron and myself on the difference between second generation groups and 3rd generation networks.