Contributions to m-learning via Twitter

This is a review of some of the activities you can do with learning through smart phones using, specially with Twitter as social network, as well as a vision of what is today and has been Twitter from the begin. Also is justified the benefits of six direct contributions of the authors in this line, after his use over four academic years, equivalent to eight editions of the course (the impartition is each half year) and working with more than two thousand students in this period. Instructions and details of how to carry out these activities, and how to evaluate them are given. It concludes with the opinion of students towards these tasks and competences worked.