As some of you know, yesterday we started the two weeks of activities for the Fifth On-line Encounter of Free Education, Culture and Software. This year, the main topic for the conference is social networks, but not in the twitter-facebook sense — Social networks as ways of understanding and modelling human-to-human interactions. Of course, there is interest from many attendees in using and taking advantage of said social network systems (and others), but the topic is far broader.