19. The system of claim 18 where: the web feed document includes a list of one or more web page documents; and the aggregation module iterates through the list and generates a request for at least one of the web page documents in the list.
20. The system of claim 19 where: the web content received from one of the web content providers has a predetermined format; and the web content processing module applies a parsing strategy based on the predetermined format to extract the text-based content from the web content.