The text is related to changes in the communication system and its influence on the historical research. Until recently research of persons, private life or his understanding of every day’s life was possible through traditional written sources like letters. However, soon this group of sources will cease to exist. The transfer from paper and pen to electronic way of communication stipulated new types of historical sources. Amongst others, e-mail, forums and discussion lists appear as a new method of communication. Future historians, researchers of any theme chronologically connected to the so called age of information will lose for one very important group of sources. Instead they will be consigned to electronic form of letters as well as of audio-vision information. At the same time new way of communication accelerated the exchange of information. That by it self lead to a change in historical methodology, in research as well as in citation.