1. Introduction
Starting outInformation Retrieval (IR)Text Data MiningThe World Wide Web

2. Protocols
DNSHTTP

3. Infrastructure
Apache HadoopDatabase designCrawler/spiderIndexerFront-end search

4. Content evaluation methods
TrustworthinessDomain AuthorityPage importance

5. Commom manipulation practices
SEOLink farmsKeyword stuffingHidden content

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