In 2011 Rachel Armstrong, architectural designer, Senior TED Fellow, Co-Director AVATAR (Advanced Virtual and Technological Architectural Research Laboratory), University of Greenwich, presented "Beyond Sustainability #STU01" at Svenska Twitteruniversititetet, the Swedish Twitter University.
The Swedish Twitter University, founded by Marcus Nilsson, probably as an experiment, conducted micro-courses that consisted of 25 tweets (i.e. 140-character messages) that were presented over an appointed hour, during which the instructor addressed questions, also in the form of tweets. It was unclear whether this "university," which might more accurately be characterized as an educational forum, had any association with a physical address; it appeared to exist only in cyberspace.
When I took another look at this entry in September 2020 the Swedish Twitter University appeared to have curtailed operations in 2012. However, the original website was still accessible.