This document summarizes an open cross-institutional professional development course called BYOD4L (Bring Your Own Device for Learning) run by two UK universities. The course was offered online in January and July 2014 using social media and was open to educators from various institutions. Participants engaged in collaborative learning activities and discussions. Evaluation found that the open online format supported the sharing of ideas and creation of an international learning community among the 76 participants. The organizers aim to continue scaling the open cross-institutional model to provide affordable professional development opportunities for educators.