The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106221846/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/pagerank
Pagerank is the term used to describe the algorithms used to numerically weigh any hyperlinked documents that are to be indexed by a search engine. Google uses them to determine a Web sites relevance in a search.