It is not concerned with the semantic content of the signal. Information science is concerned with the practice of storing and retrieving information. It has become associated with the study of library management systems. They serve a cultural role in preserving and organising artifacts and ideas. Newsgroups, bulletin boards, listservers, etc.
Electronic journals provide faster and cheaper publication of research results.
In a traditional library, anything there has been bought and therefore someone has deemed it of sufficient quality. There is no such implicit guarantee with web material. Everything in a traditional library is copyrighted, to protect publishers and authors. Almost everything on the web is not copyrighted. In the former case, there is a need for publishers, printers, bookshops, etc.