Intensive development of Web 2.0 allowing people to communicate on the Internet resulted in a situation when almost every aspect of everyday life is represented in digital space. In spite of research using digital data being rapidly growing, interpretation of digital data is still based on models of social reality when social data was collected by question-based methods. More fruitful usage of digital data in social research might demand a fundamental reconsideration of basic sociological concepts. The article offers interpretation of the Internet as a space of digital footprints related not only to Internet subcultures, but also social reality. The purpose of this article is to answer the question how changes in the nature of data available to sociologists affect revision of basic sociological models such as social reality and social actor. Digital footprints are seen as unobtrusive measures. Some contradictions of digital footprints are described: unobtrusive character versus socio-technical construction; n