With regard to a platform device (100) placed on a web-site and networked with a plurality of ID-detectable users or participants for the purpose of collecting and processing items of information stored on a plurality of in each case code-identifiable and in each case theme-dependent storage sites (110) of a platform by said users or participants, there is achieved modifiability of the stored information by the network participants according to strictly predefined processing criteria and with the creation of swarm knowledge in that the storage sites (110) formed on the platform are subdivided into a plurality of themes and are in each case formed by a dual unit (DuU), said dual unit (DuU) comprising in each case a first storage site 111 provided with initial information assigned to a predefined theme and formulated by an initial participant and adapted so as to be non-editable by any other individual user-participant and a second storage site (112) which is assigned to the first storage site (111) and which is editable by any of the individual user-participants and is adapted for acceptance of the input of additional information by the plurality of user-participants such as is relevant to the initial information stored at the first storage site (111).