Spam is the biggest threat to organic search engines, whose goal is to provide quality search results for keywords or phrases entered by their users. Google's PageRank algorithm update ("BigDaddy") in February 2006—the final stage of Google's major update ("Jagger") that began in mid-summer 2005—specifically targeted spamdexing with great success. This update thus enabled Google to remove a large amount of mostly computer-generated duplicate content from its index.
Back in the 'dot-com' days, I was often contacted by site owners with an idea for a new site who were trying to work out how much revenue they'll be able to raise depending on the number of visitors to their site and the different advertising options they select. These days, startups and innovation continue, so this post is aimed at explaining the ad revenue model options available. The main difference today is that you may have a mobile app-only revenue model and that has options for in-app purchases. These can be modelled through tweaking the affiliate model field in our spreadsheet.
Online advertisers can collect data on their ads' effectiveness, such as the size of the potential audience or actual audience response,:119 how a visitor reached their advertisement, whether the advertisement resulted in a sale, and whether an ad actually loaded within a visitor's view.:59 This helps online advertisers improve their ad campaigns over time.