The Web 2.0, with online social technologies such as social networking services, blogs, wikis, or microbloging, has brought the vision of the Internet as a social landscape in which people are engaged in a multitude of social activities. This editorial of the special issue ‘Social Web and Identity’ discusses the importance of identity in the context of the Social Web, introducing the different papers of this special issue and the different aspects associated to these online identities. The topics covered in (...) this issue include how people define their identity in blogs and what is the articulation between online and offline identities in these systems. It also presents an article studying the privacy issues in online social networks and more specifically how these risks are perceived and how people can control their identity in this context. The next article compares privacy in two different categories of social systems (social network and collaborative workspace). Finally, another article discusses to what extent the current legislation, such the data protection regulations directive 95/46/EC, is providing the right instrument for dealing with privacy issues. (shrink)