Social networks have been a hot topic in the past year, not least because of the buzz around the Oscar-winning film about the founding of Facebook. Even in countries with relatively low internet connectivity, use of social networking sites is on the rise – just ask Timor-Leste’s President José Ramos Horta and his 378 Facebook friends. But even before the internet empowered us to connect and communicate at the speed of a whim, we have all lived fully immersed in social networks. Social networks are the links between family and friends, classmates and teammates, coworkers and colleagues, enemies and ‘frenemies’. They are the relationships – around 150 meaningful ones, according to Dunbar’s number – that feed and bound our choices and actions, provide us with emotional sustenance and sounding boards, and provide structure to our lives. But beyond their intrinsic value, what do these connections mean – for individuals, for communities, and for development?