Click on the circles below to see the tracing of how content is shared and updated amongst search engines..

Note:
Red arrow indicates search engine optimized results
Blue arrow indicates secondary search engine optimization results (this is where a search provider may have their own results engine and as a secondary option they pull listings from another engine to have more results)
Green arrow results indicate search directories (these are achieved through manual submissions)
Yellow listings are indicitive of paid search results such as Overture(Yahoo Search Marketing) or Google Adwords.