Googling shows that these four countries, along with Chile and Brazil, appear to have enthusiastic linux communities as well as a number of specialist companies providing linux based services
The use of MOOC's is not covered by this survey. The increasing availabilty of MOOC's may allow students to access MOOC materials by leveraging off the increased internet access provided via these projects
None of the above projects appear to make extensive use of tablet computers, but given the increasing availability of low cost Android tablets from China this may be subject to change. Currently Coursera are the only provider to have an Android delivery platform, although both Udacity and edX are working on their own initiatives.