Abstract: In a method and system for serving dynamic advertisements, tracking data identifying a consumer computer system is placed on the consumer computer system. A user interaction with a first webpage viewed using the consumer computer system is recorded. A request for an advertisement to be displayed with a second webpage viewed using the consumer computer system is received. The request includes the tracking data. An advertisement containing content including at least a product, a service, or a brand is created. The content of the advertisement is selected for the consumer computer system identified by the tracking data. The content is selected based on the recorded user interaction.

Abstract: In a method and system for delivering and monitoring web-based ads, a request is received for an advertisement to be displayed in a webpage. An advertisement is generated based on tracking data and user profile data. The tracking data identifies a consumer computer system accessing the webpage. At least one engagement event between the consumer computer system and the advertisement is recorded. An amount owed by an advertiser associated with the advertisement for the at least one engagement event is calculated using a dynamic pricing model. The amount owed is based on a type of the at least one engagement event.

Abstract: A distributed file storage and communication system stores redundant copies of segments of a file on multiple remote storage units. The file to be stored is partitioned into multiple fragments, and each of the fragments is redundantly stored on multiple remote storage units. A file tracker is maintained that identifies where each fragment is stored. Providing the file tracker to another user allows the other user to access the file. To receive and/or retrieve the file, the system retrieves each fragment by attempting to download the fragment from one of the remote storage units identified in the file tracker for the fragment; if the selected remote storage unit is not available, another storage unit is selected for attempting the download. The selection of storage units to receive each fragment may be random or targeted, or a combination of both. Preferably, each fragment is encrypted, and the intended recipient is provided a key to decrypt the fragments.