1. A method for processing and displaying a plurality of advertisements, the method comprising: receiving, from one or more advertisers, by a platform server having a processor, a plurality of advertisements to be displayed in an advertising section of one or more webpages, each advertisement intended for display for a predefined duration of time within the advertising section of the one or more webpages; transmitting, by the platform server, the plurality of advertisements for display within the advertising section of a particular webpage of the one or more webpages, the platform server determining at least a position, length, and repetition of each advertisement within the advertising section of the particular webpage, wherein the display of the plurality of advertisements is switched within a session based on the duration of the advertisements, wherein the session includes one or more transitions of active page views among the one or more webpages, further wherein the switching of the advertisements is independent of transitions in page views of the one or more webpages; computing, by the platform server, a cost incurred by each of the one or more advertisers for display of the plurality of advertisements, the cost computed as a function of a cost-per-second (CPS) model of displaying the advertisement within the session, the cost-per-second model indicative of total duration of display of corresponding one or more advertisements within the session.