Abstract : The aim of this paper is to show that the memory techniques of Internet can be defined as hypomnemata. Bernard Stiegler describes them as externalized memories. We have studied social bookmarking systems with the example of Diigo. We conducted an online survey of users from Diigo to measure the uses and demonstrate the potentials of social bookmarking. Social bookmarking systems have both individual and collective interests as "self writing". They often require technical knowledge and previous training despite their apparent simplicity.