Web Science/Part2: Emerging Web Properties/Web Search Ecosystem/The Business Model of Search Engines/quiz

{Why is online advertisement on a pay per click base such a great business model for a search engine? + The search engine is aware of the users information need and be able to deliver relevant advertisement. - Conversion rates will be much higher. + Click through rates will be much higher. - Because search engines are among the wide spreads sites in the web and useful to many users + Users will find targeted ads on a search result pase less intrusive than on other pages. + Ad slots will be quickly sold an free again
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 * even though the statement is true, it is completely unrelated to the choice of a business model
 * this is connected to higher click through rates search engines usually have