Search and Discovery: Searching the Web Stages of a transaction Discovery Find what you’re interested in Locate sellers Locate buyers Compare products Negotiation Exchange Discovery Encompasses: Search engines Recommender systems Price comparison/shopping agents Description languages
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U/B serves as an estimate of A/N, where N is the size of
1998: Altavista/Hotbot estimate: 320 million pages.
Link structure estimates over 100,000 Web communities
Often not categorized by portals