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