Back in the early days of RSS most pages didn't have an RSS feed. So aggregators would engage in a practice called scraping, which was, essentially, to mine a web page and essentially produce a feed out of it (Technorati is still a scraper, which is why it is interested in microfortats - which are used on web pages - rather than XML data formats). These days there are services to do your scraping for you, such as Feed43. In this post, Andy Dickinson described how to use Feed43 to create a custom RSS feed.
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