This article from Christian Dalsgaard, from Institute of Information and Media Studies, University of Aarhus, Denmark, talk about the Social networking sites: Transparency in online education.
The central characteristic of social networking sites is a combination of personalization and socialization. This combination has a potential to facilitate transparency between students.
Transparency is a prerequisite for distance students to work cooperatively. Transparency means that students are visible to each other as potential partners and resources.
Transparency between students means that they have insight into each other’s work, thoughts, and productions. Not least within online education, transparency is not a given. Students might work at a distance and individually, and, thus, they are not necessarily aware of the activities of other students. In their individual work, however, students write notes, search for literature, find relevant websites, write assignments, etc. This information and these products are relevant to other students.
Apresentação que realizei para o concurso que está a decorrer no slideshare, sobre histórias de Natal originais.
Espero que esteja do vosso agrado e já agora os votos são bem vindos 
This article from Carmen Holotescu and Gabriela Grosseck, related the first online course developed and run entirely on a microblogging platform.
The aim of this course was to find out if microblogging can be integrated in the lifelong learning / teaching / collaboration / business / blogging.
They wanted to investigate:
- how to integrate microblogging with other Web2.0 technologies;
- if a microblogging platform, in particular Cirip.ro, can be used as a Learning Management System (LMS), and if it has the needed facilities to run an online course;
- what are the differences between facilitating an online course on such a platform and one in a classic LMS.
http://www.cblt.soton.ac.uk/multimedia/PDFsMM09/Using microblogging in education.pdf