VideoPal is a novel video based asynchronous communication system. Like Pen Pal, VideoPal is designed for children using multi-media video to extend their international friendships.
Reference: Du, H. et al. 2011. VideoPal: An Asynchronous Video Based Communication System to Connect Children from US and Greece. In CSCW 2011.
Inkpen, K., Du, H., Roseway, A., Hoff, A., Johns, P. 2012. Video Kids: Augmenting Close Friendships with Asynchronous Video Conversations in VideoPal.
http://research.microsoft.com/apps/pubs/default.aspx?id=141717
