Abstract: Advertisements over a network, such as the Internet, by extracting an index file of suppliers of search result sets for a plurality of keywords and/or an index of ads to be placed. A keyword in a received query may be matched to the suppliers of related search result sets and/or the ads to be placed in the index file(s). The search results may be ranked based on various criteria such as yield, click through rates and history of dealings. Search result sets for the keywords from the matching suppliers and the ads to be placed may be combined to produce a search result set ranked in accordance with estimated yields for advertisements associated with each result in the search result set and delivered in response to the received query. The search results in the combined set may be reranked and/or repriced.

Abstract: A method of enhancing search results provided over the Internet may include providing a service over the Internet to members of a group of service users, the service resulting in multiple selections of each of a plurality of web pages by different members of the group, maintaining a first database of web pages selected by members of the group, maintaining a first index of web pages from the first database excluding identification of members of the group, maintaining a global index of web pages, searching the first index and the global index in response to a query string provided by a search engine user and providing a search results set to the search engine user including search results from both the first index and the global index.