Some compare changes to the ways of communication, life and business caused by social media to the changes that industrial revolution has brought to human civilisation. Number of users of the Facebook social network is approaching 600 million; Wikipedia contains more than 14 million articles in 260 languages.
Major changes in librarianship, triggered by major changes in expectations, demographic characteristics and educational needs of library users, as well as the changing perceptions of the value and importance of information along with new, advanced technologies used in libraries are dramatically and irrepressibly changing the role of librarians.
A clear conception of what is digital library does not exist as yet. Different communities discuss digital libraries in terms of different perspectives, conceptions, models, and approaches.
