On a lot of social network sites a friend has to be approved and this only works if both users add each other. This also means that one of the two can break up and the other one loses...
Thursday and Friday the European Bloggers (Un)Conference was held at the PICNIC conference and festival. Cory Doctorow attended for an hour to answer questions from the audience about Boing Boing. A lot of these questions concerned the business model...